CN102546644A

CN102546644A - Method, equipment and system for implementing SIP (Session Initiation Protocol) calling

Info

Publication number: CN102546644A
Application number: CN2012100138277A
Authority: CN
Inventors: 沈杭东
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2012-01-17
Filing date: 2012-01-17
Publication date: 2012-07-04
Anticipated expiration: 2032-01-17
Also published as: CN102546644B

Abstract

The invention provides a method, equipment and a system for implementing SIP (Session Initiation Protocol) calling, so as to solve the problem that in the prior art, in the SIP calling process, NAT (Network Address Translator) equipment can only convert signaling IP (Internet Protocol) address information in a message header of an SIP message and cannot convert media IP address information in the message header of the SIP message, so that before a media message of calling party equipment does not arrive at an SBC (Single Board Computer), a media message of called party equipment cannot be sent to the calling party equipment by the SBC. Due to the adoption of the technical scheme provided by the embodiment of the invention, the SIP calling can be successfully completed, so that the reliability of the SIP calling can be effectively improved.

Description

Method, equipment and system for realizing SIP call

Technical Field

The present invention relates to communications technologies, and in particular, to a method, a device, and a system for implementing a Session Initiation Protocol (SIP) call.

Background

In an Internet Protocol (Internet Protocol, IP) Multimedia Subsystem (IMS) network, topology hiding may be completed by deploying a Session Border Controller (SBC) at an IMS network boundary, that is, hiding address information of a core network side to an access network side and hiding address information of the access network side to the core network side. In order to solve the deficiency of the legal IP address, the terminal may access the IMS Network through a Network Address Translation (NAT) device, and the NAT device translates one set of IP address information of the terminal into another set of IP address information, for example: the private IP address and the private network port number of a group of local area networks are converted to the legal IP address and the public network port number of the internet.

However, in the SIP calling process, since the NAT device can only convert the signaling IP address information in the header of the SIP message, but cannot convert the media IP address information in the body of the SIP message, the media message of the called device will not be sent to the calling device through the SBC before the media message of the calling device reaches the SBC, and the SIP calling cannot be completed, thereby reducing the reliability of the SIP calling.

Disclosure of Invention

The invention provides a method, equipment and a system for realizing SIP calling, which are used for improving the reliability of the SIP calling.

One aspect provides a method for implementing an SIP call, which is applied to a scenario in which a calling party device traverses a NAT device to perform an SIP call, and includes:

in the process of establishing an SIP call, an SBC sends indication information to a calling party device, wherein the indication information is used for indicating the calling party device to send a first media message according to the indication information, the first media message comprises first media address information of the calling party device and first media address information of a called party device, and the first media address information of the called party device is media address information distributed to the called party device by the SBC;

the SBC receives a second media packet, where the second media packet is obtained by converting the first media packet through the NAT device, the second media packet includes second media address information of the calling party device and first media address information of the called party device, and the second media address information of the calling party device is obtained by converting the first media address information of the calling party device through the NAT device;

the SBC obtains a corresponding relation between second media address information of the calling party equipment and third media address information of the calling party equipment according to the second media address information of the calling party equipment and the first media address information of the called party equipment, and the corresponding relation between the third media address information of the calling party equipment and the first media address information of the called party equipment, wherein the third media address information of the calling party equipment is media address information distributed to the calling party equipment by the SBC;

the SBC receives a third media message sent by called party equipment, wherein the third media message contains third media address information of the calling party equipment;

and the SBC obtains second media address information of the calling party equipment corresponding to third media address information of the calling party equipment according to the corresponding relation, and sends a fourth media message to the NAT equipment, wherein the fourth media message contains the second media address information of the calling party equipment, so that the NAT equipment sends a fifth media message to the calling party equipment, and the fifth media message contains the first media address information of the calling party equipment.

On the other hand, a method for realizing the SIP call is provided, which is applied to a scene that the calling party device traverses the NAT device to perform the SIP call, and comprises the following steps:

in the SIP call establishment process, the calling party equipment receives indication information sent by the SBC;

the calling party equipment sends a first media message according to the indication information, wherein the first media message comprises first media address information of the calling party equipment and first media address information of called party equipment, the first media address information of the called party equipment is media address information distributed by the SBC for the called party equipment, so that the SBC receives a second media message, and obtains a corresponding relation between the second media address information of the calling party equipment and third media address information of the calling party equipment according to the second media address information of the calling party equipment and the first media address information of the called party equipment and the corresponding relation between the third media address information of the calling party equipment and the first media address information of the called party equipment, and the second media message is obtained by converting the first media message through the NAT equipment, the second media message includes second media address information of the calling party device and first media address information of the called party device, the second media address information of the calling party device is obtained by converting the first media address information of the calling party device by the NAT device, and the third media address information of the calling party device is media address information allocated to the calling party device by the SBC;

the method comprises the steps that a calling party device receives a fifth media message, the fifth media message comprises first media address information of the calling party device, the fifth media message is sent after a NAT device receives a fourth media message, the fourth media message comprises second media address information of the calling party device, the fourth media message comprises third media address information of a called party device, after the SBC receives a third media message sent by the called party device, according to the corresponding relation, the second media address information of the calling party device corresponding to the third media address information of the calling party device is obtained and sent, and the third media message comprises the third media address information of the calling party device.

Another aspect provides an SBC, which is applied to a scenario in which a calling party device performs an SIP call by traversing a NAT device, and includes:

a first sending unit, configured to send indication information to the calling party device in an SIP call setup process, where the indication information is used to indicate the calling party device to send a first media packet according to the indication information, where the first media packet includes first media address information of the calling party device and first media address information of a called party device, and the first media address information of the called party device is media address information allocated by the SBC to the called party device;

a first receiving unit, configured to receive a second media packet, where the second media packet is obtained by converting the first media packet through the NAT device, and the second media packet includes second media address information of the calling party device and first media address information of the called party device, and the second media address information of the calling party device is obtained by converting the first media address information of the calling party device by the NAT device;

an obtaining unit, configured to obtain, according to second media address information of the calling party device and first media address information of the called party device, and a corresponding relationship between third media address information of the calling party device and first media address information of the called party device, a corresponding relationship between the second media address information of the calling party device and the third media address information of the calling party device, where the third media address information of the calling party device is media address information allocated by the SBC to the calling party device;

a second receiving unit, configured to receive a third media packet sent by a called party device, where the third media packet includes third media address information of the calling party device;

a second sending unit, configured to obtain, according to the corresponding relationship, second media address information of the calling party device corresponding to third media address information of the calling party device, and send a fourth media packet to the NAT device, where the fourth media packet includes the second media address information of the calling party device, so that the NAT device sends a fifth media packet to the calling party device, where the fifth media packet includes the first media address information of the calling party device.

Another aspect provides a calling party device, which is applied to a scenario in which the calling party device traverses a NAT device to perform an SIP call, and includes:

the first receiving unit is used for receiving the indication information sent by the SBC in the SIP call establishment process;

a sending unit, configured to send a first media packet according to the indication information, where the first media packet includes first media address information of the calling party device and first media address information of a called party device, and the first media address information of the called party device is media address information allocated by the SBC to the called party device, so that the SBC receives a second media packet, and obtains a corresponding relationship between the second media address information of the calling party device and third media address information of the calling party device according to the second media address information of the calling party device and the first media address information of the called party device, and a corresponding relationship between the third media address information of the calling party device and the first media address information of the called party device, where the second media packet is obtained by converting the first media packet through the NAT device, the second media message includes second media address information of the calling party device and first media address information of the called party device, the second media address information of the calling party device is obtained by converting the first media address information of the calling party device by the NAT device, and the third media address information of the calling party device is media address information allocated to the calling party device by the SBC;

a second receiving unit, configured to receive a fifth media message, where the fifth media message includes first media address information of the calling party device, the fifth media message is sent after the NAT device receives a fourth media message, the fourth media message includes second media address information of the calling party device, the fourth media message receives a third media message sent by a called party device, and then, according to the correspondence, obtains, and sends, according to the correspondence, second media address information of the calling party device corresponding to third media address information of the calling party device, and the third media message includes third media address information of the calling party device.

On one hand, the system for realizing the SIP call is applied to the scene that the calling party device traverses the NAT device to carry out the SIP call, and comprises the NAT device, the session border controller SBC as described above and the calling party device as described above

It can be known from the above technical solutions that the embodiments of the present invention can solve the problem in the prior art that, in the SIP call process, since the NAT device can only convert the signaling IP address information in the header of the SIP message, but cannot convert the media IP address information in the header of the SIP message, the media message of the called party device cannot be sent to the calling party device through the SBC before the media message of the calling party device reaches the SBC.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a flowchart illustrating a method for implementing an SIP call according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a method for implementing an SIP call according to another embodiment of the present invention;

fig. 3 is a flowchart illustrating a method for implementing an SIP call according to another embodiment of the present invention;

figure 4 is a schematic structural diagram of an SBC according to another embodiment of the present invention;

fig. 5 is a schematic structural diagram of a calling party device according to another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a flowchart of a method for implementing an SIP call according to an embodiment of the present invention, which is applied to a scenario in which a calling party device traverses a NAT device to perform an SIP call, and as shown in fig. 1, the method may include:

101. during the SIP call setup, the SBC sends indication information to the calling device, where the indication information is used to indicate the calling device to send a first media packet according to the indication information, where the first media packet includes first media address information of the calling device and first media address information of a called device, and the first media address information of the called device is media address information allocated by the SBC to the called device.

The indication information may be used to indicate the calling party device to send the first media packet.

In an application scenario of the embodiment of the present invention, the SBC may send a first SIP response message to the calling party device, where the first SIP ringing message includes the indication information. Wherein, the first SIP ringing message is sent by the SBC according to the received second SIP ringing message sent by the called party equipment. The first reply message or the second reply message may include, but is not limited to, a Ring (Ring) message (180 message), a 183 message, or a 200 OK message. For example: the calling party equipment sends SIP invitation information to the called party equipment through the NAT equipment and the SBC; after receiving the SIP invitation message, the called party sends a 180 message to the SBC; the SBC adds the indication information to the 180 message, and sends the 180 message added with the indication information to the calling party device.

In an application scenario of the embodiment of the present invention, the indication information may further be used to indicate that a port through which the calling party device sends the media packet is a media receiving port of the calling party device; accordingly, the calling party device can send the first media packet at the media receiving port of the calling party device according to the indication information, so that the problem that the media packet of the called party device cannot be sent to the calling party device through the SBC due to the inconsistency between the media receiving port and the media sending port of the sender terminal can be effectively avoided, and the reliability of the SIP call is further improved.

In an application scenario of the embodiment of the present invention, the indication information may be specifically used to indicate the calling party device to send a mute media packet, and accordingly, the first media packet and the second media packet are mute media packets, which may occupy less network transmission resources and avoid waste of network transmission resources.

102. The SBC receives a second media message, where the second media message is obtained by converting the first media message through the NAT device, the second media message includes second media address information of the calling party device and first media address information of the called party device, and the second media address information of the calling party device is obtained by converting the first media address information of the calling party device through the NAT device.

103. The SBC obtains a correspondence between the second media address information of the calling party device and the third media address information of the calling party device according to the second media address information of the calling party device and the first media address information of the called party device, and a correspondence between the third media address information of the calling party device and the first media address information of the called party device, where the third media address information of the calling party device is the media address information allocated by the SBC to the calling party device.

In an application scenario of the embodiment of the present invention, after receiving the second media packet, the SBC may obtain a corresponding relationship between the second media address information of the calling device and the third media address information of the calling device according to the second media address information of the calling device and the first media address information of the called device that are included in the second media packet, and further according to a corresponding relationship between the third media address information of the calling device and the first media address information of the called device that is obtained after the SBC receives the SIP invite message sent by the calling device and the SIP response message sent by the called device.

104. And the SBC receives a third media message sent by the called party equipment, wherein the third media message contains third media address information of the calling party equipment.

105. And the SBC obtains second media address information of the calling party device corresponding to the third media address information of the calling party device according to the corresponding relationship, and sends a fourth media message to the NAT device, where the fourth media message includes the second media address information of the calling party device, so that the NAT device sends a fifth media message to the calling party device, and the fifth media message includes the first media address information of the calling party device.

In this embodiment, during the SIP call setup, an indication message is sent to the calling party device through the SBC, where the indication message is used to indicate that the calling party device sends the first media message according to the indication message, so that the SBC can obtain the corresponding relationship between the second media address information of the calling party device and the third media address information of the calling party device according to the second media address information of the calling party device and the first media address information of the called party device that are contained in the received second media message, and further obtain the corresponding relationship between the third media address information of the calling party device and the third media address information of the calling party device according to the corresponding relationship between the third media address information of the calling party device and the first media address information of the called party device that are obtained before the SBC, and send the third media message sent by the called party device to the calling party device according to the corresponding relationship, which can solve the problem in the prior art during the SIP call, the NAT equipment can only convert the signaling IP address information in the message header of the SIP message, but cannot convert the media IP address information in the message header of the SIP message, so that the media message of the called party equipment cannot be sent to the calling party equipment through the SBC before the media message of the calling party equipment reaches the SBC.

Fig. 2 is a flowchart of a method for implementing an SIP call according to another embodiment of the present invention, which is applied to a scenario in which a calling party device traverses a NAT device to perform an SIP call, as shown in fig. 2, the method may include:

201. in the process of establishing the SIP call, the calling party device receives the indication information sent by the SBC.

The indication information may be used to indicate the calling party device to send a first media packet.

In an application scenario of the embodiment of the present invention, the calling party device may receive a first SIP response message sent by the SBC, where the first SIP ringing message includes the indication information. Wherein, the first SIP ringing message is sent by the SBC according to the received second SIP ringing message sent by the called party equipment. The first reply message or the second reply message may include, but is not limited to, a Ring (Ring) message (180 message), a 183 message, or a 200 OK message. For example: the calling party equipment sends SIP invitation information to the called party equipment through the NAT equipment and the SBC; after receiving the SIP invitation message, the called party sends a 180 message to the SBC; the SBC adds the indication information to the 180 message, and sends the 180 message added with the indication information to the calling party device.

202. The calling party equipment sends a first media message according to the indication information, the first media message comprises first media address information of the calling party equipment and first media address information of called party equipment, the first media address information of the called party equipment is media address information allocated to the called party equipment by the SBC, so that the SBC receives a second media message, and obtains a corresponding relation between the second media address information of the calling party equipment and the third media address information of the calling party equipment according to the second media address information of the calling party equipment and the first media address information of the called party equipment and the corresponding relation between the third media address information of the calling party equipment and the first media address information of the called party equipment, the second media message is obtained by converting the first media message through the NAT equipment, the second media message includes the second media address information of the calling party device and the first media address information of the called party device, the second media address information of the calling party device is obtained by the NAT device converting the first media address information of the calling party device, and the third media address information of the calling party device is the media address information allocated to the calling party device by the SBC.

In another embodiment of the present invention, after receiving the second media message, the SBC may obtain a corresponding relationship between the second media address information of the calling device and the third media address information of the calling device according to the second media address information of the calling device and the first media address information of the called device included in the second media message, and further according to a corresponding relationship between the third media address information of the calling device and the first media address information of the called device, which is obtained after the SBC receives the SIP invite message sent by the calling device and the SIP response message sent by the called device.

203. The calling party device receives a fifth media message, the fifth media message includes the first media address information of the calling party device, the fifth media message is sent after the NAT device receives a fourth media message, the fourth media message includes the second media address information of the calling party device, the SBC receives a third media message sent by a called party device, and then, according to the corresponding relationship, the second media address information of the calling party device corresponding to the third media address information of the calling party device is obtained and sent, and the third media message includes the third media address information of the calling party device.

In this embodiment, in the SIP call setup process, the calling device can send the first media packet according to the indication information by receiving the indication information sent by the SBC, so that the SBC can obtain the corresponding relationship between the second media address information of the calling device and the third media address information of the calling device according to the second media address information of the calling device and the first media address information of the called device contained in the received second media packet, and further according to the corresponding relationship between the third media address information of the calling device and the first media address information of the called device obtained before the SBC, and send the third media packet sent by the called device to the calling device according to the corresponding relationship, which can solve the problem in the prior art in the SIP call process, the NAT equipment can only convert the signaling IP address information in the message header of the SIP message, but cannot convert the media IP address information in the message body of the SIP message, so that the media message of the called party equipment cannot be sent to the calling party equipment through the SBC before the media message of the calling party equipment reaches the SBC.

It should be noted that: the NAT device related to the embodiment of the present invention is a network device with a network address translation function, and may include, but is not limited to, a router, a firewall, a switch, or a server, which is not limited in this embodiment of the present invention.

In an application scenario of the embodiment of the present invention, the calling device may receive, through the NAT device, a first SIP ringing (Ring) message sent by the SBC, where the first SIP response message includes the indication information, and the first SIP response message is sent by the SBC according to a received second SIP response message sent by the called device. The first reply message or the second reply message may include, but is not limited to, a Ring (Ring) message (180 message), a 183 message, or a 200 OK message. For example: the calling party equipment sends SIP invitation information to the called party equipment through the NAT equipment and the SBC; after receiving the SIP invitation message, the called party sends a 180 message to the SBC; the SBC adds the indication information to the 180 message, and sends the 180 message added with the indication information to the calling party device through the NAT device.

After receiving the first media packet, the NAT device may convert the first media address information of the calling party device included in the first media packet to obtain the second media address of the calling party device, and send a second media packet to the SBC, where the second media packet includes the second media address information of the calling party device and the first media address information of the called party device.

After receiving the second media message, the SBC may learn the second media address information of the calling device and the first media address information of the called device, which are contained in the second media message, and obtain a corresponding relationship between the third media address information of the calling device and the first media address information of the called device, which is obtained after receiving the SIP invite message sent by the calling device and the SIP response message sent by the called device, and further obtain a corresponding relationship between the second media address information of the calling device and the third media address information of the calling device according to the information.

Therefore, the SBC can send the third media packet sent by the called party device to the calling party device according to the obtained corresponding relationship between the second media address information of the calling party device and the third media address information of the calling party device, and can solve the problem that the media packet of the called party device cannot be sent to the calling party device through the SBC before the media packet of the calling party device reaches the SBC because the NAT device can only convert the signaling IP address information in the packet header of the SIP packet and cannot convert the media IP address information in the packet header of the SIP packet in the SIP call process in the prior art.

It can be understood that: the first media packet, the second media packet, the third media packet, the fourth media packet, and the fifth media packet related in the above embodiments of the present invention may include, but are not limited to, a Real-time Transport Protocol (RTP) packet.

It should be noted that: the SBC according to the embodiment of the present invention does not have to perform topology hiding, that is, the SBC may not perform topology hiding on the messages sent by the sender device and the receiver device, that is, the second media address information of the caller device is the same as the third media address information of the caller device, and the first media address information of the callee device is the same as the second media address information of the callee device, which is not limited in the embodiment of the present invention.

For example, as shown in fig. 3, a flow chart of a method for implementing a SIP call according to another embodiment of the present invention is shown. The body of the SIP message is described by a session description Protocol (SDP for short). As shown in fig. 3, the method for implementing a SIP call of this embodiment may include:

301. the calling party equipment sends an SIP Invite (Invite) message to the NAT equipment;

for example: the calling party equipment sends an SIP invitation message to the NAT equipment, and the message body of the SIP invitation message contains the media IP address 192.168.1.2 of the calling party equipment and the media receiving port number 3008 of the calling party equipment.

302. The NAT equipment converts the signaling address information in the message header of the SIP invitation message, does not convert the media address information distributed by the NAT equipment in the message body of the SIP invitation message for the calling party equipment, and sends the converted SIP invitation message to the SBC;

for example: the NAT device does not convert the media address information allocated to the calling device by the NAT device in the body of the SIP invite message, so the body of the SIP invite message sent to the SBC by the NAT device still contains the media IP address 192.168.1.2 of the calling device and the media receiving port number 3008 of the calling device.

303. The SBC carries out topology hiding on the SIP invitation message and sends the SIP invitation message subjected to topology hiding to called party equipment;

for example: after the SBC receives the SIP invite message from the SBC, it may convert, according to a topology hiding scheme in the prior art, signaling address information converted by an NAT device in a routing (VIA) header field of the received SIP invite message as a calling party device, and convert media address information of the calling party device in an SDP body of the SIP invite message, to perform topology hiding, and send the SIP invite message subjected to topology hiding to a called party device. For example: the message body of the SIP invite message sent by the SBC to the called party device includes the media IP address 20.1.3.8 allocated to the calling party device by the SBC performing topology hiding and the media port number 5007 allocated to the calling party device by the SBC performing topology hiding.

It can be understood that: in order to simplify the flow, in the flow related to this embodiment, interaction of the network element SIP message between the called party device and the SBC is omitted, and for a detailed flow, reference may be made to related descriptions in the prior art.

304. The called party equipment sends SIP response message to SBC;

305. the SBC performs topology hiding on the SIP response message, adds indication information used for indicating calling party equipment to send a mute media message at a media receiving port of the calling party equipment in the SIP response message subjected to topology hiding, and sends the SIP response message containing the indication information to the NAT equipment;

for example: after receiving the SIP response message from the called party device, the SBC may convert signaling address information of the called party device in a routing (VIA) header field of the received SIP response message and convert media address information of the called party device in an SDP body of the SIP response message according to a topology hiding scheme in the prior art to perform topology hiding, add the indication information to the SIP response message for topology hiding, and send the SIP response message for topology hiding to the NAT device. For example: the message body of the SIP response message sent by the SBC to the NAT device includes the media IP address 20.1.3.8 allocated to the called device by the SBC for topology hiding, and the media port number 7003 allocated to the called device by the SBC for topology hiding, and the SIP response message further includes the above-mentioned indication information a ═ natpacket.

It can be understood that: the SBC may further obtain, according to the SIP invite message sent by the calling party device and the SIP response message sent by the called party device, a correspondence between the media address information allocated by the SBC to the calling party device, that is, the media IP address 20.1.3.8 and the media port number 5007, and the media address information allocated by the SBC to the called party device, that is, the media IP address 20.1.3.8 and the media port number 7003.

306. The NAT equipment converts the signaling address information in the message header of the SIP response message, does not convert the media address information distributed by the NAT equipment in the message body of the SIP response message for the calling party equipment, and sends the converted SIP response message to the calling party equipment;

it can be understood that: at 306, the NAT device does not translate any address information of the called terminal.

For example: the NAT device does not convert the media address information of the calling device in the message body of the SIP response message, so the message body of the SIP response message sent by the NAT device to the calling device still contains the media IP address 192.168.1.2 of the calling device and the media receiving port number 3008 of the calling device.

307. The calling party equipment sends an RTP mute message to the NAT equipment at a media receiving port of the calling party equipment according to the indication information;

for example: after the calling party device receives the SIP response message, according to the indication information, the RTP mute message is immediately sent to the NAT device at the media receiving port of the calling party device, where a source address in the RTP mute message is media address information of the calling party device, that is, a media IP address 192.168.1.2 and a media receiving port number 3008, and a destination address is media address information allocated by the SBC to the called party device, that is, a media IP address 20.1.3.8 and a media receiving port number 7003.

308. The NAT equipment converts the media address information of the calling party equipment in the message header of the RTP mute message and sends the converted RTP mute message to the SBC;

for example: the source address in the RTP mute message sent by the NAT device to the SBC is the media address information converted by the NAT device for the calling device, i.e., the media IP address 20.1.3.8 and the media receiving port number 8028, and the destination address is the media address information allocated by the SBC for the called device, i.e., the media IP address 20.1.3.8 and the media receiving port number 7003.

309. The SBC obtains the corresponding relation between the media address information converted by the NAT equipment for the calling party equipment and the media address information distributed by the SBC for the calling party equipment according to a source address in the RTP mute message, namely the media address information converted by the NAT equipment for the calling party equipment, and a destination address, namely the media address information distributed by the SBC for the called party equipment, and the previously obtained corresponding relation between the media address information distributed by the SBC for the calling party equipment and the media address information distributed by the SBC for the called party equipment;

specifically, after receiving the RTP mute message, the SBC may learn the media address information converted by the NAT device for the caller device and the media address information allocated by the SBC for the callee device, which are contained in the RTP mute message, and obtain the correspondence between the media address information allocated by the SBC for the caller device and the media address information allocated by the SBC for the callee device after receiving the SIP invite message sent by the caller device and the SIP response message sent by the callee device, and further obtain the correspondence between the media address information converted by the NAT device for the caller device and the media address information allocated by the SBC for the caller device according to the information.

For example: according to the correspondence between the media address information converted by the NAT device for the calling device, that is, the media IP address 20.1.3.8 and the media receiving port number 8028, and the media address information allocated by the SBC for the called device, that is, the media IP address 20.1.3.8 and the media receiving port number 7003, and the obtained media address information allocated by the SBC for the calling device, that is, the media IP address 20.1.3.8 and the media port number 5007, and the media address information allocated by the SBC for the called device, that is, the media IP address 20.1.3.8 and the media port number 7003, the SBC obtains the correspondence between the media address information converted by the NAT device for the calling device and the media address information allocated by the SBC for the calling device, that is, 20.1.3.8: 8028 and 20.1.3.8: 5007.

310. The SBC receives an RTP message, such as a color ring, sent by called party equipment;

for example: the source address (SRC) in the RTP packet received by the SBC is the media address information (media IP address 20.1.5.9 and media port number 9000) of the called device, and the destination address (DST) is the media address information (media IP address 20.1.3.8 and media port number 5007) allocated by the SBC to the calling device.

311. The SBC obtains a destination address in the RTP message according to the obtained corresponding relation, namely media address information distributed by the SBC for calling party equipment and media address information converted by corresponding NAT equipment for the calling party equipment, and sends the RTP message to the NAT equipment by using the obtained media address information converted by the NAT equipment for the calling party equipment;

it can be understood that: the SBC may further perform topology hiding on the RTP packet. After receiving the RTP packet from the called party device, the SBC may convert the media address information of the called party device in the received RTP packet according to a topology hiding scheme in the prior art to perform topology hiding. For example: the source address in the RTP packet sent by the SBC to the NAT device performs topology hiding for the SBC on the media address information allocated to the called device, i.e., the media IP address 20.1.3.8 and the media receiving port number 7003, and the destination address is obtained by the SBC according to the obtained correspondence, i.e., the media IP address 20.1.3.8 and the media receiving port number 8028.

312. The NAT equipment converts the media address information in the RTP message and sends the converted RTP message to the calling party equipment.

It can be understood that: at 312, the NAT device does not translate any address information for the called terminal.

For example: the NAT device does not convert the source address in the RTP packet, so the source address in the RTP packet sent by the NAT device to the calling device still performs topology hiding for the SBC for the media address information allocated to the called device, that is, the media IP address 20.1.3.8 and the media receiving port number 7003, and the destination address is the media IP address 192.168.1.2 of the calling device and the media receiving port number 3008 of the calling device.

Therefore, the calling party equipment receives the RTP message sent by the called party equipment, and SIP calling can be carried out after the called party equipment is waited to be off-hook, so that the SIP calling can be successfully completed.

In this embodiment, in the SIP call setup process, the SBC sends, to the calling party device through the NAT device, indication information for indicating that the calling party device sends a mute media message at a media receiving port of the calling party device, and further receives, through the NAT device, an RTP mute message sent by the calling party device, where the RTP mute message includes media address information converted by the NAT device for the calling party device after passing through the NAT device, and obtains a correspondence between the media address information converted by the NAT device for the calling party device and media address information allocated by the SBC for the calling party device according to the RTP mute message, so that the SBC sends, according to the obtained correspondence, the RTP message of the called party device to the calling party device, which can solve the problem in the prior art that, in the SIP call process, the media message at the calling party device is caused by the fact that the NAT device can only convert signaling IP address information in a message header of the SIP message, but cannot convert media IP address information in a message header of the SIP message, and cannot convert media Before the message reaches the SBC, the media message of the called party equipment can not be sent to the calling party equipment through the SBC. Because the indication information can indicate that the port of the calling party equipment for sending the media message is the media receiving port of the calling party equipment, the problem that the media message of the called party equipment cannot be sent to the calling party equipment through the SBC due to the fact that the media receiving port of the sender terminal is inconsistent with the media sending port can be effectively avoided, and therefore reliability of the SIP call is further improved.

It should be noted that: while, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

Fig. 4 is a schematic structural diagram of an SBC according to another embodiment of the present invention, which is applied to a scenario in which a calling party device performs an SIP call through a NAT device, as shown in fig. 4, the SBC according to this embodiment may include a first sending unit 41, a first receiving unit 42, an obtaining unit 43, a second receiving unit 44, and a second sending unit 45. The first sending unit 41 is configured to send, in an SIP call setup process, indication information to the calling party device, where the indication information is used to indicate that the calling party device sends a first media packet according to the indication information, where the first media packet includes first media address information of the calling party device and first media address information of a called party device, and the first media address information of the called party device is media address information allocated by the SBC to the called party device; the first receiving unit 42 is configured to receive a second media packet, where the second media packet is obtained by converting the first media packet through the NAT device, the second media packet includes second media address information of the calling party device and first media address information of the called party device, and the second media address information of the calling party device is obtained by converting the first media address information of the calling party device by the NAT device; the obtaining unit 43 is configured to obtain a corresponding relationship between the second media address information of the calling party device and the third media address information of the calling party device according to the second media address information of the calling party device and the first media address information of the called party device, and a corresponding relationship between the third media address information of the calling party device and the first media address information of the called party device, where the third media address information of the calling party device is media address information allocated by the SBC to the calling party device; the second receiving unit 44 is configured to receive a third media packet sent by a called party device, where the third media packet includes third media address information of the calling party device; the second sending unit 45 is configured to obtain, according to the corresponding relationship, second media address information of the calling party device corresponding to third media address information of the calling party device, and send a fourth media packet to the NAT device, where the fourth media packet includes the second media address information of the calling party device, so that the NAT device sends a fifth media packet to the calling party device, where the fifth media packet includes the first media address information of the calling party device.

In an application scenario of the embodiment of the present invention, the first sending unit 41 may specifically send a first SIP response message to the calling party device, where the first SIP response message includes the indication information.

In another application scenario of the embodiment of the present invention, the indication information may be further used to indicate that a port through which the calling party device sends the media packet is a media receiving port of the calling party device; accordingly, the calling party device can send the first media packet at the media receiving port of the calling party device according to the indication information, so that the problem that the media packet of the called party device cannot be sent to the calling party device through the SBC due to the inconsistency between the media receiving port and the media sending port of the sender terminal can be effectively avoided, and the reliability of the SIP call is further improved.

In this embodiment, during the SIP call setup, the SBC sends, to the calling party device through the first sending unit, indication information for indicating that the calling party device sends the first media packet according to the indication information, so that the obtaining unit can obtain a corresponding relationship between the second media address information of the calling party device and the third media address information of the calling party device according to the second media address information of the calling party device and the first media address information of the called party device, which are included in the second media packet received by the first receiving unit, and further according to a corresponding relationship between the third media address information of the calling party device and the first media address information of the called party device, which are obtained before the SBC, and sends, to the calling party device, the third media packet sent by the called party device and received by the second receiving unit according to the corresponding relationship obtained by the obtaining unit, the problem that the media message of the called party equipment cannot be sent to the calling party equipment through the SBC before the media message of the calling party equipment reaches the SBC due to the fact that the NAT equipment can only convert the signaling IP address information in the message header of the SIP message and cannot convert the media IP address information in the message header of the SIP message in the prior art can be solved.

Fig. 5 is a schematic structural diagram of a calling party device according to another embodiment of the present invention, which is applied to a scenario where the calling party device performs an SIP call through a NAT device, as shown in fig. 5, the calling party device according to this embodiment may include a first receiving unit 51, a sending unit 52, and a second receiving unit 53. Wherein,

the first receiving unit 51 is configured to receive, in an SIP call setup process, indication information sent by a session border controller SBC;

the sending unit 52 is configured to send a first media packet according to the indication information, where the first media packet includes first media address information of the calling party device and first media address information of a called party device, the first media address information of the called party device is media address information allocated by the SBC to the called party device, so that the SBC receives a second media packet, and obtains a corresponding relationship between the second media address information of the calling party device and third media address information of the calling party device according to the second media address information of the calling party device and the first media address information of the called party device, and a corresponding relationship between the third media address information of the calling party device and the first media address information of the called party device, where the second media packet is obtained by converting the first media packet through the NAT device, the second media message includes second media address information of the calling party device and first media address information of the called party device, the second media address information of the calling party device is obtained by converting the first media address information of the calling party device by the NAT device, and the third media address information of the calling party device is media address information allocated to the calling party device by the SBC;

the second receiving unit 53 is configured to receive a fifth media message, where the fifth media message includes first media address information of the calling party device, the fifth media message is sent after the NAT device receives a fourth media message, the fourth media message includes second media address information of the calling party device, the fourth media message receives a third media message sent by a called party device, and then, according to the correspondence relationship, obtains, and sends, according to the correspondence relationship, second media address information of the calling party device corresponding to third media address information of the calling party device, and the third media message includes third media address information of the calling party device.

In an application scenario of the embodiment of the present invention, the first receiving unit 51 may specifically receive a first SIP response message sent by the SBC, where the first SIP ringing message includes the indication information.

In another application scenario of the embodiment of the present invention, the indication information may be further used to indicate that a port through which the calling party device sends the media packet is a media receiving port of the calling party device; accordingly, the sending unit 52 may send the first media packet at the media receiving port of the calling party device according to the indication information, so as to effectively avoid the problem that the media packet of the called party device is not sent to the calling party device through the SBC due to the inconsistency between the media receiving port of the sender terminal and the media sending port, thereby further improving the reliability of the SIP call.

In this embodiment, in the SIP call setup process, the calling party device receives the indication information sent by the SBC through the first receiving unit, so that the sending unit can send the first media packet according to the indication information, so that the SBC can obtain the corresponding relationship between the second media address information of the calling party device and the third media address information of the calling party device according to the second media address information of the calling party device and the first media address information of the called party device included in the received second media packet, and further according to the corresponding relationship between the third media address information of the calling party device and the first media address information of the called party device obtained before the SBC, and send the third media packet sent by the called party device to the calling party device according to the corresponding relationship, which can solve the problem in the prior art in the SIP call process, the NAT equipment can only convert the signaling IP address information in the message header of the SIP message, but cannot convert the media IP address information in the message header of the SIP message, so that the media message of the called party equipment cannot be sent to the calling party equipment through the SBC before the media message of the calling party equipment reaches the SBC.

Another embodiment of the present invention further provides a system for implementing an SIP call, which is applied to a scenario in which a calling party device performs an SIP call by traversing an NAT device, and includes an SBC in an embodiment corresponding to fig. 4 and a calling party device in an embodiment corresponding to fig. 5, so that in an SIP call setup process, indication information is sent to the calling party device through the SBC, where the indication information is used to indicate that the calling party device sends a first media packet according to the indication information, so that the SBC can obtain a corresponding relationship between second media address information of the calling party device and first media address information of the called party device according to second media address information of the calling party device and first media address information of the called party device that are included in a received second media packet, and further obtain a corresponding relationship between second media address information of the calling party device and third media address information of the calling party device according to a corresponding relationship between third media address information of the calling party device and first media address information of the called party device that are obtained before the sb, and according to the corresponding relation, sending the third media message sent by the called party equipment to the calling party equipment, and solving the problem that in the prior art, in the SIP calling process, because the NAT equipment can only convert the signaling IP address information in the message header of the SIP message and cannot convert the media IP address information in the message header of the SIP message, the media message of the called party equipment cannot be sent to the calling party equipment through the SBC before the media message of the calling party equipment reaches the SBC.

Further, the system provided in this embodiment may further include the NAT device.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be converted, or some technical features may be equivalently replaced; and the conversion or the replacement does not cause the essence of the corresponding technical scheme to depart from the spirit and the scope of the technical scheme of the embodiments of the invention.

Claims

1. A method for realizing Session Initiation Protocol (SIP) calling is applied to a scene that calling party equipment traverses Network Address Translation (NAT) equipment to carry out SIP calling, and is characterized by comprising the following steps:

in the process of establishing an SIP call, a Session Border Controller (SBC) sends indication information to a calling party device, wherein the indication information is used for indicating the calling party device to send a first media message according to the indication information, the first media message comprises first media address information of the calling party device and first media address information of a called party device, and the first media address information of the called party device is media address information distributed to the called party device by the SBC;

2. The method of claim 1, wherein the indication information is further used to instruct the calling party device to send the first media packet at a media receiving port of the calling party device according to the indication information.

3. The method according to claim 1 or 2, wherein the SBC sending indication information to the calling party device specifically includes:

and the SBC sends a first SIP response message to the calling party equipment, wherein the first SIP response message contains the indication information.

4. A method for realizing Session Initiation Protocol (SIP) calling is applied to a scene that calling party equipment traverses Network Address Translation (NAT) equipment to carry out SIP calling, and is characterized by comprising the following steps:

in the process of establishing an SIP call, the calling party equipment receives indication information sent by a Session Border Controller (SBC);

5. The method according to claim 4, wherein the sending, by the calling party device, the first media packet according to the indication information specifically includes:

and the calling party equipment sends a first media message at a media receiving port of the calling party equipment according to the indication information.

6. A Session Border Controller (SBC) is applied to a scene that a calling party device crosses a Network Address Translation (NAT) device to carry out SIP calling, and is characterized by comprising the following steps:

7. The SBC of claim 6, wherein the first sending unit is specifically configured to

And sending a first SIP response message to the calling party equipment, wherein the first SIP response message contains the indication information.

8. A calling party device is applied to a scene that the calling party device traverses a Network Address Translation (NAT) device to carry out SIP calling, and is characterized by comprising the following steps:

a first receiving unit, configured to receive, in an SIP call setup process, indication information sent by a session border controller SBC;

9. Calling party device according to claim 8, characterized in that the sending unit is specifically configured to

And sending a first media message at a media receiving port of the calling party equipment according to the indication information.

10. A system for implementing a session initiation protocol SIP call, for use in a scenario where a calling party device makes a SIP call across a network address translation, NAT, device, comprising a NAT device, a session border controller, SBC, as claimed in claim 6 or claim 7, and a calling party device as claimed in claim 8 or claim 9.