CN114244811A

CN114244811A - Method, system, computer storage medium and electronic device for realizing secondary dialing

Info

Publication number: CN114244811A
Application number: CN202111539527.8A
Authority: CN
Inventors: 陆振锋; 熊蔚; 王新新
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2022-03-25

Abstract

The disclosure relates to the technical field of communication, and in particular relates to a method and a system for realizing secondary dialing, a storage medium and electronic equipment. The method comprises the following steps: acquiring a signaling message of a Media Gateway Control Function (MGCF) from the beginning to the end in the process of intercommunication secondary dialing of a long-term evolution voice-bearing VoLTE network and a Circuit Switching (CS) network; detecting the signaling message based on a preset cross-domain dual-tone multi-frequency rule, wherein the preset cross-domain dual-tone multi-frequency rule is used for indicating a target DTMF transmission mode supported by a CS network and a target media network element which does not participate in media conversion in signaling message transmission; and if the signaling message is inconsistent with the preset cross-domain dual-tone multi-frequency rule, correcting the signaling message to ensure that the signaling message conforms to the cross-domain dual-tone multi-frequency rule. By detecting and correcting signaling messages from the MGCF to the MGCF, only one media conversion is carried out in the whole process of secondary dialing in the intercommunication process of the VoLTE network and the CS network, and the success rate of the secondary dialing of the VoLT E is improved.

Description

Method, system, computer storage medium and electronic device for realizing secondary dialing

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a method for implementing secondary dialing, a system for implementing secondary dialing, a computer storage medium, and an electronic device.

Background

In many service scenarios, a user needs to interact with a network by means of pressing keys of a terminal device (i.e., secondary dialing), such as recharging, dialing an extension number after dialing a switchboard, dialing a customer center number, and the like. DTMF (Dual Tone Multi-Frequency) signals are a kind of user signaling between telephone and exchange in telephone system, and a user presses a key of a terminal device to generate a DTMF signal.

In the related technology, in the transmission process of the DTMF signal in the secondary dialing scene, the DTMF signal is carried in the DTMF message, the payload of the DTMF message cannot directly check the number corresponding to the signal, and the operation and maintenance can only perform end-to-end confirmation on media conversion equipment by one media level recording, but because each conversion point relates to different manufacturer equipment, some equipment manufacturers even do not support media level recording, which brings great difficulty to confirm whether the secondary dialing is really and effectively transmitted, and the signal is easily damaged due to too many media conversion times in the whole end-to-end network, which affects the real effectiveness of the secondary dialing.

It is to be noted that the information invented in the background section above is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure aims to provide a method and a system for implementing secondary dialing, a computer storage medium, and an electronic device, so as to improve the effectiveness of secondary dialing in the interworking process between a VoLTE network and a CS network.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.

According to one aspect of the present disclosure, a method for implementing secondary dialing is provided, including: acquiring a signaling message to and from a Media Gateway Control Function (MGCF) in the process of intercommunication secondary dialing of a long-term evolution voice-bearing VoLTE network and a Circuit Switching (CS) network, wherein the content of the signaling message at least comprises dual-tone multi-frequency DTMF information, coding and decoding information and Session Description Protocol (SDP) media information; detecting the signaling message based on a preset cross-domain dual tone multi-frequency rule, wherein the preset cross-domain dual tone multi-frequency rule is used for indicating a target DTMF transmission mode supported by the circuit switching CS network and a target media network element which does not participate in media conversion in the signaling message transmission; and when the signaling message is inconsistent with the preset cross-domain dual tone multi-frequency rule, correcting the signaling message so as to enable the signaling message to accord with the cross-domain dual tone multi-frequency rule.

In an exemplary embodiment of the present disclosure, the signaling messages to and from the media gateway control function MGCF include at least a first signaling message sent by the VoLTE IMS network to the MGCF, a second signaling message sent by the CS network to the MGCF, and a third signaling message sent by the MGCF to the VoLTE IMS network; and the first signaling message is originated by a user terminal and is transmitted to the MGCF through a border session controller PSBC and a network element call session control function S-CSCF of the VoLTE IMS network.

In an exemplary embodiment of the disclosure, the target DTMF transmission mode at least includes a target voice codec type and a target DTMF media stream sampling frequency supported by the CS network; when the signaling message is inconsistent with the preset cross-domain dual tone multi-frequency rule, correcting the signaling message to make the signaling message conform to the cross-domain dual tone multi-frequency rule, including: and if redundant voice coding and decoding types and redundant DTMF media stream sampling frequencies which are inconsistent with the target voice coding and decoding types and the target DTMF media stream sampling frequencies exist in the voice coding and decoding types and the DTMF media stream sampling frequencies carried by the first signaling message, deleting the redundant voice coding and decoding types and the redundant DTMF media stream sampling frequencies in the first signaling message.

In an exemplary embodiment of the present disclosure, before the detecting the signaling message based on the preset cross-domain dual tone multi-frequency rule, the method further includes: determining the preset cross-domain dual-tone multi-frequency rule at least comprises the following steps: and pre-configuring and storing the media network element address information of the first target media network element controlled by the CS network and the second target media network element controlled by the MGCF. It is to be understood that the terms "first" and "second" are used herein merely as labels, and are not intended to limit the number of their objects.

In an exemplary embodiment of the present disclosure, when the signaling message is inconsistent with the preset cross-domain dual tone multi frequency rule, correcting the signaling message so that the signaling message conforms to the cross-domain dual tone multi frequency rule includes: if the second signaling message contains the first media address information of the first target media network element, correcting a Session Description Protocol (SDP) corresponding to the second signaling message to indicate that the first target media network element does not participate in the transmission of the second signaling message; wherein the second signaling message is that the MGCF receives the last response information containing media address information from the CS network.

In an exemplary embodiment of the present disclosure, when the signaling message is inconsistent with the preset cross-domain dual tone multi frequency rule, correcting the signaling message so that the signaling message conforms to the cross-domain dual tone multi frequency rule includes: and if the third signaling message contains second media network element address information of the second target media network element, correcting a session description protocol SDP corresponding to the third signaling message to indicate that the second target media network element does not participate in the transmission of the third signaling message.

In an exemplary embodiment of the present disclosure, before the detecting the signaling message based on the preset cross-domain dual tone multi-frequency rule, the method further includes: according to the first seven characters in the branch in the via header field in the signaling messages to and from the VoLTE IMS network and the MGCF as well as to and from the MGCF and the CS network, and the time information and the call identifier corresponding to the signaling messages, the signaling messages to and from the MGCF are associated into the same session object, and the signaling message corresponding to one session object is taken as one record for storage.

According to one aspect of the present disclosure, there is provided a system for implementing secondary dialing, including: a signaling monitoring module, configured to acquire a signaling message to and from a media gateway control function MGCF during a secondary dialing process in which a long term evolution voice-over-lte network and a circuit switching CS network are intercommunicated, where content of the signaling message at least includes dual tone multi-frequency DTMF information, coding and decoding information, and session description protocol SDP media information; an error correction module, configured to detect the signaling message based on a preset cross-domain dual tone multi-frequency rule, where the preset cross-domain dual tone multi-frequency rule is used to indicate a target DTMF transmission mode supported by the circuit switched CS network and a target media network element that does not participate in media conversion in the signaling message transmission; and the communication module is used for correcting the signaling message when the signaling message is inconsistent with the preset cross-domain dual tone multi-frequency rule so as to enable the signaling message to accord with the cross-domain dual tone multi-frequency rule.

According to an aspect of the present disclosure, there is provided a computer storage medium having a computer program stored thereon, the computer program, when executed by a processor, implementing any one of the above-described methods of implementing double dialing.

According to an aspect of the present disclosure, there is provided an electronic device including: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to execute any one of the above methods for implementing secondary dialing via execution of the executable instructions.

The method for realizing secondary dialing in the exemplary embodiment of the disclosure obtains the signaling message from MGCF in the process of intercommunication secondary dialing between VoLTE network and CS network, the content of the signaling message at least comprises dual-tone multi-frequency DTMF information, coding and decoding information and session description protocol SDP media information; detecting a signaling message based on a preset cross-domain dual-tone multi-frequency rule, wherein the preset cross-domain dual-tone multi-frequency rule is used for indicating a target DTMF transmission mode supported by a Circuit Switching (CS) network and a target media network element which does not participate in media conversion in signaling message transmission; and when the signaling message is inconsistent with the preset cross-domain dual-tone multi-frequency rule, correcting the signaling message so as to enable the signaling message to accord with the cross-domain dual-tone multi-frequency rule. On one hand, a preset cross-domain dual-tone multi-frequency rule indicates a target DTMF transmission mode supported by a CS network and a target media network element related to media conversion in non-participation signaling message transmission, when a signaling message of a forward MGCF is inconsistent with the cross-domain dual-tone multi-frequency rule, the signaling message is corrected to enable the signaling message to accord with the cross-domain dual-tone multi-frequency rule in a whole-course end-to-end network, an intermediate office (namely the target media network element) in the DTMF transmission process is not involved in media conversion, so that the problems of signal damage and the like caused by multiple times of DTMF transmission mode conversion are avoided, the real effectiveness of secondary dialing is improved, the signaling message of the forward MGCF is transmitted in the target DTMF transmission mode supported by the CS network by stipulating, and the occurrence of secondary dialing faults is further avoided; on the other hand, the method and the device only need to detect, analyze and correct the signaling messages of the current MGCF, and can realize that only one-time media conversion is carried out in the whole process of secondary dialing in the intercommunication process of the VoLTE network and the CS network under the condition that the network architecture is not changed, thereby improving the effective success rate of the VoLTE secondary dialing.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:

fig. 1 is a schematic diagram illustrating a VoLTE secondary dialing scenario in the related art;

fig. 2 shows a flowchart of a method of implementing secondary dialing in accordance with an exemplary embodiment of the present disclosure;

figure 3 illustrates the signaling flow of network elements before and after a VoLTE SIP call to and from the MGCF according to an exemplary embodiment of the present disclosure;

FIG. 4 illustrates an XDR record schematic in accordance with an exemplary embodiment of the present disclosure;

fig. 5 shows a schematic diagram of a VoLTE secondary dialing scenario following a cross-domain dual tone multi-frequency rule according to an example embodiment of the present disclosure;

fig. 6 shows a schematic structural diagram of a system for implementing secondary dialing according to an exemplary embodiment of the present disclosure;

fig. 7 is a schematic diagram illustrating an execution scenario corresponding to a system for implementing secondary dialing according to an exemplary embodiment of the present disclosure;

FIG. 8 shows a schematic diagram of a storage medium according to an exemplary embodiment of the present disclosure;

fig. 9 shows a block diagram of an electronic device according to an exemplary embodiment of the present disclosure.

In the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

Detailed Description

Exemplary embodiments will now be described more fully with reference to the accompanying drawings. The exemplary embodiments, however, may be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known structures, methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.

The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in the form of software, or in one or more software-hardened modules, or in different networks and/or processor devices and/or microcontroller devices.

In the related art, the way in which DTMF digits are transmitted as compressed voice frames is a signal sent by a terminal device in a network. DTMF can be used only in voice or voice and data interactive services. A User can generate a DTMF signal through a terminal device key (for example, keys 0 to 9, a to D, and # on a mobile terminal UE (User Equipment)), where a frequency spectrum of each DTMF signal includes two peak frequencies. At present, there are three ways for an IMS (IP Multimedia Subsystem) network to transmit DTMF signals, which are:

1) and (3) out-of-band transmission: the number is transmitted by a session initiation protocol SIP signaling message (INFO);

2) DTMF in-band transmission: the number is transmitted by real-time transmission protocol RTP data content, the number is taken as common voice, the number signal is directly coded according to the voice coding mode of the current call, and the number signal is put into a voice media stream and transmitted in a bearer channel;

3) RFC2833 inband transmission: the number is transmitted by the rule and format of RFC2833, and according to the protocol of RFC2833, the number is coded separately according to a specific coding and decoding (different coding from that adopted by normal voice), and is packaged into an independent RTP packet transmission mode in a bearer channel. RFC2833 can be further divided into broadband RFC2833 and narrowband RFC2833, and the sampling frequencies are 16000Hz and 8000Hz respectively.

Referring to fig. 1, a VoLTE secondary dialing scenario in the related art is shown, and as can be seen from fig. 1, the transmission of DTMF signals in the secondary dialing scenario in the related art includes, at a signaling level: calling user terminal UE, calling side border session controller PSBC, VoLTE IMS network, MGCF (media gateway MGW), area center first-level soft switch DC1-SS (MGW), called side platform equipment; the media layer includes: calling handset terminal UE, calling side PSBC, MGCF (MGW), DC1-SS (MGW), and called side platform equipment. The DTMF signal is carried in the G.711 message, and the number corresponding to the signal cannot be directly checked from the payload of the DTMF message. From the traditional perspective of operation and maintenance, end-to-end confirmation can only be performed on media conversion equipment one by one through media level recording, but because each conversion point relates to different manufacturer equipment, some equipment manufacturers even do not support media level recording, which brings great difficulty to confirm whether secondary dialing is really and effectively transmitted.

Based on this, in the exemplary embodiment of the present disclosure, a method of implementing secondary dialing is first provided. Referring to fig. 2, the method for implementing the secondary dialing includes the following steps:

step S210: acquiring a signaling message to and from a Media Gateway Control Function (MGCF) in the process of intercommunication secondary dialing of a long-term evolution voice-bearing VoLTE network and a Circuit Switching (CS) network, wherein the content of the signaling message at least comprises dual-tone multi-frequency DTMF information, coding and decoding information and Session Description Protocol (SDP) media information;

step S220: detecting a signaling message based on a preset cross-domain dual-tone multi-frequency rule, wherein the preset cross-domain dual-tone multi-frequency rule is used for indicating a target DTMF transmission mode supported by a Circuit Switching (CS) network and a target media network element which does not participate in media conversion in signaling message transmission;

step S230: and when the signaling message is inconsistent with the preset cross-domain dual-tone multi-frequency rule, correcting the signaling message so as to enable the signaling message to accord with the cross-domain dual-tone multi-frequency rule.

According to the method for realizing secondary dialing in the embodiment of the example, a preset cross-domain dual-tone multi-frequency rule indicates a target DTMF transmission mode supported by a CS network and a target media network element involved in media conversion in non-participation signaling message transmission, when a signaling message of a forward MGCF is inconsistent with the cross-domain dual-tone multi-frequency rule, the signaling message is corrected to enable the signaling message to accord with the cross-domain dual-tone multi-frequency rule in a whole-course end-to-end network, an intermediate office (namely the target media network element) does not participate in DTMF media conversion in a DTMF transmission process, so that the problems of signal damage and the like caused by multiple times of conversion of DTMF transmission modes are avoided, the real effectiveness of secondary dialing is improved, the signaling message of the forward MGCF is transmitted in the target DTMF transmission mode supported by the CS network, and the occurrence of secondary dialing faults is further avoided; the method and the device only need to detect, analyze and correct the signaling messages of the current MGCF, and can realize that only one media conversion is carried out in the whole process of secondary dialing in the intercommunication process of the VoLTE network and the CS network under the condition that the network architecture is not changed, thereby improving the effective success rate of the VoLTE secondary dialing.

The method for implementing the secondary dialing in the exemplary embodiment of the present disclosure is further described below with reference to fig. 2.

In step S210, a signaling message to and from the media gateway control function MGCF is obtained during the inter-working secondary dialing process between the long term evolution voice over lte network and the circuit switched CS network.

In the exemplary embodiment of the present disclosure, in the process of interworking between the VoLTE network and the CS network and the secondary dialing, the signaling messages to and from the MGCF at least include a first signaling message sent by the VoLTE IMS network to the MGCF, a second signaling message sent by the CS network to the MGCF, and a third signaling message sent by the MGCF to the VoLTE IMS network; the first signaling message is originated by a user terminal and is transmitted to the MGCF through a border session controller PSBC and a network element call session control function S-CSCF of the VoLTE IMS network. Wherein, the content of the signaling message at least comprises dual-tone multi-frequency DTMF information, one or more coding and decoding information and session description protocol SDP media information; the one or more types of codec information at least include G7.11 codec (an audio coding method), the DTMF information at least includes information such as a speech codec type and a sampling frequency of the DTMF media stream (e.g., a ═ rtpmap:102telephone-event/8000), and the SDP media information at least includes media address information.

Specifically, fig. 3 shows a signaling flow of network elements before and after a VoLTE SIP call is sent to and from an MGCF according to an exemplary embodiment of the present disclosure, and as shown in fig. 3, the process includes:

on the MGCF, obtaining (CALL ID: a) a first signaling message (first signaling message) sent by the VoLTE IMS network to the MGCF, comprising: one or more of voice coding and decoding information and DTMF information;

on MGCF, obtaining the first signaling message (CALL ID: B) sent by MGCF to CS network, including: one or more of voice coding and decoding information and DTMF information;

on MGCF, SIP response messages (second signaling messages) sent by CS network to MGCF (CALL ID: B) are acquired in sequence according to time stamp, including: media information (e.g., media address information), one or more speech codecs; the SIP response message sent by the CS network to the MGCF is sent to a CS network device (e.g., DC1-SS) by a landing service platform in the CS network, where the landing service platform may be a platform that needs to perform a secondary dialing related service, such as a related platform of a bank.

On the MGCF, SIP response messages (third signaling messages) sent by the MGCF to the VoLTE IMS network (CALL ID: a) are sequentially obtained in time stamp order, including: media information (e.g., media address information), one or more speech codecs.

Wherein, the VoLTE IMS network sends (CALL ID: a) a first signaling message (first signaling message) to the MGCF, and the early-stage flow includes: the user terminal UE starts a first signaling message (first signaling message) and sends the first signaling message to a border session controller PSBC, the PSBC sends the first signaling message to a VoLTE IMS network element S-CSCF, and the S-CSCF then forwards the first signaling message to the MGCF. Thus, the information (speech codec, DTMF information) carried by the first signaling message sent by the VoLTE IMS network to the MGCF is actually the information (speech codec, DTMF information) that the user terminal UE originated the first signaling message. PSBC, S-CSCF encodes the voice of the first signaling message (SIP message) originated by UE, and transmits DTMF information to MGCF.

In some possible embodiments, signaling messages to and from the MGCF may be monitored and retrieved and stored. The signaling messages of the forward and backward MGCF can be associated as the same session object and stored according to the first seven characters in the branch in the via header field in the signaling messages of the forward and backward VoLTE IMS network and MGCF and the forward and backward MGCF and CS network, and the time information and the call identifier corresponding to the signaling messages. Continuing with FIG. 3, the data corresponding to CALL ID: a's associated signaling message is associated with a CALL ID: the related signaling message of B is related by using the first seven characters in the branch in the same via header field as a tie, and the related signaling message of a session object (e.g., session) is stored as a record. Wherein, the time information and the call identifier corresponding to the signaling message should be simultaneously stored in each record.

Optionally, each record may be stored in an XDR (X detail record) storage in an XDR manner, so as to facilitate detection of each record, improve detection efficiency, and perform subsequent corrective action, where X identifies a specific detail type, and the disclosure does not specially limit the specific detail type. Referring to fig. 4, which illustrates XDR recording according to an exemplary embodiment of the disclosure, as shown in fig. 4, media address information in a signaling message returned to the MGCF by the table vims-MGCF between the VoLTE IMS network and the MGCF, the table MGCF-other between the MGCF and the CS network (DC1-SS), and the table MGCF-other-media is recorded in a signaling message returned to the MGCF by the CS network (DC1-SS), respectively, wherein the signaling message from the MGCF is associated and saved as the same session object according to the first seven characters in the bridge in the via header fields in the signaling messages from the VoLTE IMS network to the MGCF and from the MGCF to the CS network, and according to the time information (start time) and the CALL identifier (CALL ID) corresponding to the signaling message.

Through the exemplary embodiment, the first seven characters in the branch in the signaling message of the to-and-from VoLTE IMS network and MGCF and the to-and-from MGCF and CS network, as well as the time information and the call identifier corresponding to the signaling message, can be associated with the signaling message of the to-and-from MGCF as the same session object, so that three different device network elements of the VoLTE IMS network, MGCF and CS network (related media network elements) are realized, and the association is realized as one session object for the zone by using the first seven characters (such as via-branch-front7char) in the branch in the via header, and the related signaling message corresponding to one session object is recorded as one XDR, and the extraction and detection efficiency of the signaling message can be improved by storing the messages one by one.

In step S220, the signaling message is detected based on a preset cross-domain dual tone multi-frequency rule.

In an exemplary embodiment of the present disclosure, a preset cross-domain dual tone multi frequency rule is used to indicate a target DTMF transmission mode supported by a circuit switched CS network and a target media network element that does not participate in signaling message transmission. The target DTMF transmission mode at least comprises a target voice coding and decoding type and a target DTMF media stream sampling frequency supported by a CS network; the target DTMF transmission mode can be DTMF in-band transmission and narrowband RFC2833 transmission.

And detecting whether the signaling message is consistent with the cross-domain dual-tone multi-frequency rule or not in the signaling negotiation process based on the signaling message of the current MGCF according to a preset cross-domain dual-tone multi-frequency rule, thereby detecting whether secondary dialing is effective or not in the intercommunication process of the VoLTE network and the CS network.

In step S130, when the signaling message is inconsistent with the preset cross-domain dtmf rule, the signaling message is corrected, so that the signaling message conforms to the cross-domain dtmf rule.

In an exemplary embodiment of the present disclosure, when it is detected that the signaling message is inconsistent with a preset cross-domain dtmf rule, the signaling message is corrected, so that the signaling message conforms to the cross-domain dtmf rule.

In some possible embodiments, as described above, the DTMF transmission manner at least includes a target voice Codec type and a target DTMF media stream sampling frequency supported by the CS network, where the target DTMF media stream sampling frequency is 8000Hz, and the corresponding target voice Codec type is AMR (Adaptive Multi-Rate Speech Codec, Adaptive Multi-Rate Speech coding), that is, the target DTMF media stream sampling frequency supported by the CS network is 8000Hz, so that it can be detected whether a first signaling message sent by the VoLTE IMS network to the MGCF carries wideband RFC2833(DTMF media stream sampling frequency is 16000Hz, and the corresponding voice Codec type is AMR-WB (Adaptive Multi-Rate wideband Speech coding), and if so, the first Multi-Rate Speech coding needs to be corrected.

In some possible embodiments, if there are an excess voice codec type and an excess DTMF media stream sampling frequency that are inconsistent with the target voice codec type and the target DTMF media stream sampling frequency in the voice codec type and DTMF media stream sampling frequency carried by the first signaling message, the excess voice codec type and excess DTMF media stream sampling frequency in the first signaling message are deleted. For example, the first signaling message sent by the VoLTE IMS network to the MGCF is:

a rtpmap 107AMR-WB/16000/1 (speech coding and decoding type)

a rtpmap 105AMR/8000/1 (speech codec type)

a rtpmap 101telephone-event/16000(DTMF sampling frequency)

Rtpmap 102telephone-event/8000(DTMF sampling frequency)

Wherein, the first signaling message carries telehone-event/16000 and telehone-event/8000 simultaneously, and if the rule in the cross-domain dual-tone multi-frequency rule only carrying telehone-event/8000 (target DTMF media stream sampling frequency) to the CS network is not consistent, the related information content corresponding to wideband RFC2833(DTMF media stream sampling frequency is 16000Hz) is deleted, that is, the first and third row contents are deleted.

Through the exemplary embodiment, the related signaling message content which is not in accordance with the cross-domain dual tone multi-frequency rule can be deleted, so that the target voice coding and decoding type and the target DTMF media stream sampling frequency carried in the first signaling message are supported by the CS network, secondary dialing faults are not easy to cause, and the effective success rate of secondary dialing is improved.

In some possible embodiments, before detecting the signaling message based on the preset cross-domain dual tone multi frequency rule, the preset cross-domain dual tone multi frequency rule may be determined, and at least the media network element address information of the first target media network element controlled by the CS network and the second target media network element controlled by the MGCF may be preconfigured and stored.

Referring to table 1 and table 2, the media network element address information of the first target media network element controlled by the CS network and the media network element address information of the second target media network element controlled by the MGCF are respectively shown, wherein a specific value may be an IPV4(Internet Protocol version 4) address.

TABLE 1 static table dc1-ss-mgw-media

dc1-ss-mgw-media-ip	dc1-ss-mgw-description
		10.11.y.1	dc1-ss-mgw
10.11.y.2	dc1-ss-mgw
		10.11.y.3	dc1-ss-mgw
10.11.y.4	dc1-ss-mgw
		10.11.y.5	dc1-ss-mgw
……	……

TABLE 2 static Table mgcf-mgw-media

mgcf-mgw-media-ip	mgcf-mgw-description
		10.242.x.1	mgcf-ncmgw1
10.242.x.2	mgcf-ncmgw1
		10.242.x.3	mgcf-ncmgw1
10.242.x.4	mgcf-ncmgw2
		10.242.x.5	mgcf-ncmgw2
10.242.x.6	mgcf-jjmgw1
		10.242.x.7	mgcf-jjmgw1
10.242.x.8	mgcf-jjmgw2
		……	……

The signaling message can be detected based on the pre-configured media network element address information of the first target media network element controlled by the CS network and the second target media network element controlled by the MGCF.

In some possible embodiments, if a second signaling message sent by the CS network to the MGCF includes the first media address information of the first target media network element, the session description protocol SDP corresponding to the second signaling message is corrected to indicate that the first target media network element does not participate in media conversion in transmission of the second signaling message. The second signaling message is that the MGCF receives the last response message containing the media address information from the CS network, and the first target media network element is a media network element controlled by the CS network, such as DC1-SS-MGW, MSCe (Mobile Switching Center emulation) -MGW, and the like. The SDP is a session description protocol, and describes and negotiates multimedia session parameters, including but not limited to media information (including media address information) and voice codec information.

For example, the MGCF receives 183/180/200(invite)/update/re-invite response messages from the CS network, i.e. the second signaling message (most commonly 183/180/200 (invite)) as follows:

o＝HuaweiSoftX3000 43849616 17334IN IP4 10.0.7.4

s＝Sip Call

c ═ IN IP410.11. y.1 (media address information)

The media information in the c line in the message contains media address information 10.11, y.1 of MGW controlled by CS network DC1-SS, which indicates that MGW controlled by intermediate office CS 1-SS participates in media conversion, and indicates that the second signaling message is inconsistent with the cross-domain dual tone multi frequency rule, and the second signaling message needs to be corrected. When the from-CS-media-ip value recorded by the mgcf-other-media table acquired in real time and the dc1-ss-mgw-media-ip recorded by the static table 1dc1-ss-mgw-media table have the same value, the second signaling message is indicated to have the first media address information of the first target media network element, namely the second signaling message is inconsistent with the cross-domain dual tone multi-frequency rule.

In some possible embodiments, a session description protocol SDP corresponding to the second signaling message may be corrected to indicate that the first target media network element is not involved in the transmission of the second signaling message involving media conversion. For example, a corrective instruction is executed to the CS network (e.g., DC1-SS) indicating that DC1-SS-mgw is not participating in the media conversion.

Through the exemplary embodiment, the first target media network element controlled by the CS network does not participate in media conversion, so that the media conversion times in the whole process from end to end are reduced, signal damage is avoided, and the effective success rate of secondary dialing is improved.

In some possible embodiments, if the third signaling message sent by the MGCF to the VoLTE IMS network includes the second media network element address information of the second target media network element, the session description protocol SDP corresponding to the third signaling message is corrected to indicate that the second target media network element does not participate in media conversion in the transmission of the third signaling message. The second target media network element is a media network element controlled by the MGCF, such as MGW, a media network element IM-MGW controlled by the MGCF, and the like.

For example, in 183/180/200(invite)/update/re-invite issued by the MGCF to the VoLTE IMS network (most common with 183/180/200 (invite)), that is, the third signaling message is:

o＝HuaweiUgc3200 1389487050 1389487051IN IP4 10.242.177.9

s＝SipCall

c ═ IN IP410.242. x.1 (media address information)

The media address information of the c row in the third signaling message includes the media address 10.242.x.1 of the MGW controlled by the intermediate office MGCF, which indicates that the MGW controlled by the intermediate office MGCF participates in media conversion, that is, the third signaling message is inconsistent with the cross-domain dual tone multi-frequency rule. Then correction of the third signaling message is required. Wherein, when the value of from-MGCF-media-ip recorded by the scscf-MGCF-media table acquired in real time has the same value as the value of media-ip recorded by the 2MGCF-mgw-media table of the static table, it indicates that the third signaling message has the second media address information of the second target media network element, i.e. the third signaling message is inconsistent with the cross-domain dual tone multi-frequency rule.

In some possible embodiments, a session description protocol SDP corresponding to the third signaling message is corrected to indicate that the second target media network element is not involved in the transmission of the third signaling message. For example, error correction instructions are executed to the MGCF, instructing MGCF-mgw not to participate in media conversion.

Through the exemplary embodiment, the second target media network element controlled by the MGCF does not participate in media conversion, so that the media conversion times in the whole end-to-end process are reduced, signal damage is avoided, and the effective success rate of secondary dialing is improved.

Based on this, referring to fig. 5, which is a view of the VoLTE secondary dialing scenario that follows the cross-domain dual tone multi-frequency rule in the exemplary embodiment of the present disclosure, as shown in the figure, signal conversion is performed only once in the whole end-to-end network, on the basis of MGCF codec adaptation, the conversion of RFC2833 signals and in-band DTMF signals is completed by the boundary session controller PSBC of VoLTE, and other intermediate office media gateways do not participate in media conversion, so that signal damage caused by multiple media conversions is reduced, and the real effectiveness of secondary dialing in the interworking process between the VoLTE network and the CS network is improved.

With continuing reference to fig. 3, the following describes, with reference to fig. 3, a procedure for successfully completing a primary call and performing a secondary dialing according to the exemplary embodiment of the present disclosure:

1) and INVITE message (VoLTE IMS network sends to MGCF)

The SIP message is:

……

m＝audio 14832RTP/AVP 107 106 105 104 8 01 102

……

a＝rtpmap:107AMR-WB/16000/1

a＝rtpmap:105AMR/8000/1

……

a＝rtpmap:101telephone-event/16000

a＝rtpmap:102telephone-event/8000

……

wherein 8 in m-audio 14832RTP/AVP 107106105104801102 represents g.711 codec, default implicitly supporting in-band DTMF capability;

107AMR-WB/16000/1 represents the support of adaptive multi-rate wideband speech coding, and the sampling frequency is 16000 Hz;

105AMR/8000/1 represents the support of the self-adapting multi-rate speech coding, and the sampling frequency is 8000 Hz;

101telephone-event/16000, which indicates that the broadband RFC2833 is supported and the sampling frequency of the DTMF media stream is 16000 Hz;

and a, rtpmap, 102telephone-event/8000 shows that narrow-band RFC2833 is supported, and the sampling frequency of the DTMF media stream is 8000 Hz.

2) And INVITE message (MGCF sends to DC1-SS outside IMS domain)

The SIP message is:

……

m＝audio 10632RTP/AVP 8 102

……

a＝rtpmap:105AMR/8000/1

……

m＝rtpmap:102telephone-event/8000

……

therefore, the process is transmitted through 8(G.711 codec), the MGCF deletes the AMR-WB voice codec and the wideband RFC2833(DTMF sampling frequency 16000Hz) at the VoLTE side, and transmits the AMR voice codec and the narrowband RFC2833(DTMF sampling frequency 8000 Hz).

3)183 message (DC1-SS returns to MGCF), 183 message has no SDP, and does not carry the address information of the backward target media network element, i.e. MGW controlled by DC1-SS does not participate in media conversion.

4)183 message (MGCF returns to VoLTE IMS network), pass through 3) message, because there is no media network element address information of the target media network element, i.e. IM-MGW controlled by MGCF does not participate in media conversion.

5)180 message (DC1-SS return to MGCF)

The SIP message is:

……

c＝IN IP4 10.114.209

t＝0 0

m＝audio 16964RTP/AVP 8

……

it can be seen that m is audio 16964RTP/AVP 8, which indicates that the backward office also supports 8 (representing g.711 codec); IN IP410.11.4.209, the media address information indicating the back office is 10.11.4.209.

6)180 message (MGCF returns to VoLTE IMS network), transparent transmission 5) message, IM-MGW controlled by MGCF does not participate in media conversion.

7)200OK message (DC1-SS returns to MGCF), wherein, the 200OK message has no SDP and does not carry the backward office media address information.

8)200OK message (MGCF returns to VoLTE IMS network), pass through 7) message, IM-MGW that MGCF controls does not participate in media conversion.

It can be known from the exemplary embodiment that, by detecting, analyzing and correcting the signaling message from and to the MGCF, when it is found that AMR-WB/16000 and telephone-event/16000 carried by the user terminal are transmitted to the MGCF through the VoLTE IMS network, the signaling message is corrected with error correction, and when it is found that the media network elements controlled by the intermediate office (e.g., MGCF and CS network), such as MGW, participate in media conversion, the SDP of the signaling message is corrected with error correction, and the media network elements controlled by the intermediate office are instructed not to participate in media conversion, so that the number of media conversion from end to end in the whole process is reduced by detecting and correcting the DTMF information and the SDP media information, signal damage is avoided, and the effective success rate of secondary dialing is improved.

According to the method for realizing the secondary dialing of the embodiment of the disclosure, a preset cross-domain dual-tone multi-frequency rule is used for indicating a target DTMF transmission mode supported by a CS network and a target media network element involved in media conversion in non-participation signaling message transmission, when a signaling message of a forward MGCF is inconsistent with the cross-domain dual-tone multi-frequency rule, the signaling message is corrected to be in accordance with the cross-domain dual-tone multi-frequency rule in a whole-course end-to-end network, and an intermediate office (namely the target media network element) does not participate in the media conversion in the DTMF transmission process, so that the problems of signal damage and the like caused by the conversion of the DTMF transmission mode for many times are avoided, the real effectiveness of the secondary dialing is improved, the signaling message of the forward MGCF is transmitted in the target DTMF transmission mode supported by the CS network, and the occurrence of the secondary dialing fault is further avoided; the method and the device only need to detect, analyze and correct the signaling messages of the current MGCF, and can realize that only one media conversion is carried out in the whole process of secondary dialing in the intercommunication process of the VoLTE network and the CS network under the condition that the network architecture is not changed, thereby improving the effective success rate of the VoLTE secondary dialing.

In an exemplary embodiment of the present disclosure, a system for implementing secondary dialing is also provided. Referring to fig. 6, the system 600 for implementing secondary dialing may include a signaling detection module 610, an error correction module 620, and a communication module 630. In particular, the amount of the solvent to be used,

a signaling monitoring module 610, configured to acquire a signaling message from a media gateway control function MGCF during a secondary dialing process in which a long term evolution voice-over-lte network is intercommunicated with a circuit-switched CS network, where the content of the signaling message at least includes dual-tone multi-frequency DTMF information, coding/decoding information, and session description SDP media information;

an error correction module 620, configured to detect the signaling message based on a preset cross-domain dual tone multi-frequency rule, where the preset cross-domain dual tone multi-frequency rule is used to indicate a target DTMF transmission mode supported by a circuit switched CS network and a target media network element involved in media conversion in the process of not participating in signaling message transmission;

a communication module 630, configured to correct the signaling message when the signaling message is inconsistent with the preset cross-domain dtmf rule, so that the signaling message conforms to the cross-domain dtmf rule.

In some possible embodiments, the system 600 for implementing secondary dialing may further include a data storage module, configured to store a signaling message to and from the MGCF in a process of performing secondary dialing by interworking between the lte-long term evolution voice over lte network and the CS network, where the signaling message is acquired by the signaling monitoring module 610.

In some possible embodiments, when the communication module 630 finds that the signaling message is inconsistent with the preset cross-domain dtmf rule, referring to the schematic implementation scenario corresponding to the system for implementing secondary dialing shown in fig. 7, an error correction instruction (error correction instruction 2 and error correction instruction 3) may be sent to the MGCF or CS network (DC1-SS) to instruct the media gateway controlled by the MGCF or CS network (DC1-SS) not to participate in media conversion.

In some possible embodiments, when the communication module 630 finds that the signaling message is inconsistent with the preset cross-domain DTMF rule, an error correction instruction (see error correction instruction 1 in fig. 7) may be further executed to the MGCF, so that the MGCF deletes the unwanted speech coding and decoding type and the unwanted DTMF media stream sampling frequency in the signaling message that are inconsistent with the cross-domain DTMF rule.

Since each functional module of the system for implementing secondary dialing in the exemplary embodiment of the present disclosure is the same as that in the embodiment of the present invention of the method for implementing secondary dialing, it is not described herein again.

It should be noted that although in the above detailed description several modules or units of the system implementing secondary dialing are mentioned, this division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.

In addition, in the exemplary embodiments of the present disclosure, a computer storage medium capable of implementing the above method is also provided. On which a program product capable of implementing the above-described method of the present specification is stored. In some possible embodiments, aspects of the present disclosure may also be implemented in the form of a program product comprising program code for causing a terminal device to perform the steps according to various exemplary embodiments of the present disclosure described in the "exemplary methods" section above of this specification, when the program product is run on the terminal device.

Referring to fig. 8, a program product 800 for implementing the above method according to an exemplary embodiment of the present disclosure is described, which may employ a portable compact disc read only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the program product of the present disclosure is not limited thereto, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

A computer readable signal medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Program code for carrying out operations of the present disclosure may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).

In addition, in an exemplary embodiment of the present disclosure, an electronic device capable of implementing the above method is also provided. As will be appreciated by one skilled in the art, aspects of the present disclosure may be embodied as a system, method or program product. Accordingly, various aspects of the present disclosure may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system.

An electronic device 900 according to such an embodiment of the disclosure is described below with reference to fig. 9. The electronic device 900 shown in fig. 9 is only an example and should not bring any limitations to the functionality or scope of use of the embodiments of the present disclosure.

As shown in fig. 9, the electronic device 900 is embodied in the form of a general purpose computing device. Components of electronic device 900 may include, but are not limited to: the at least one processing unit 910, the at least one storage unit 920, a bus 930 connecting different system components (including the storage unit 920 and the processing unit 910), and a display unit 940.

Wherein the storage unit stores program code that is executable by the processing unit 910 to cause the processing unit 910 to perform steps according to various exemplary embodiments of the present disclosure described in the above section "exemplary method" of the present specification.

The storage unit 920 may include readable media in the form of volatile memory units, such as a random access memory unit (RAM)921 and/or a cache memory unit 922, and may further include a read only memory unit (ROM) 923.

Storage unit 920 may also include a program/utility 924 having a set (at least one) of program modules 925, such program modules 925 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.

Bus 930 can be any of several types of bus structures including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

The electronic device 900 may also communicate with one or more external devices 1000 (e.g., keyboard, pointing device, bluetooth device, etc.), with one or more devices that enable a user to interact with the electronic device 900, and/or with any devices (e.g., router, modem, etc.) that enable the electronic device 900 to communicate with one or more other computing devices. Such communication may occur via input/output (I/O) interface 950. Also, the electronic device 900 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN) and/or a public network, such as the Internet) via the network adapter 960. As shown, the network adapter 960 communicates with the other modules of the electronic device 900 via the bus 930. It should be appreciated that although not shown, other hardware and/or software modules may be used in conjunction with the electronic device 900, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.

Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which may be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.

Furthermore, the above-described figures are merely schematic illustrations of processes included in methods according to exemplary embodiments of the present disclosure, and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.

Claims

1. A method for realizing secondary dialing is characterized by comprising the following steps:

acquiring a signaling message to and from a Media Gateway Control Function (MGCF) in the process of intercommunication secondary dialing of a long-term evolution voice-bearing VoLTE network and a Circuit Switching (CS) network, wherein the content of the signaling message at least comprises dual-tone multi-frequency DTMF information, coding and decoding information and Session Description Protocol (SDP) media information;

detecting the signaling message based on a preset cross-domain dual tone multi-frequency rule, wherein the preset cross-domain dual tone multi-frequency rule is used for indicating a target DTMF transmission mode supported by the circuit switching CS network and a target media network element which does not participate in media conversion in the signaling message transmission;

and when the signaling message is inconsistent with the preset cross-domain dual tone multi-frequency rule, correcting the signaling message so as to enable the signaling message to accord with the cross-domain dual tone multi-frequency rule.

2. The method of claim 1, wherein the signaling messages to and from the Media Gateway Control Function (MGCF) comprise at least a first signaling message sent by a VoLTE IP multimedia subsystem network (VoLTE IMS) network to the MGCF, a second signaling message sent by the CS network to the MGCF, and a third signaling message sent by the MGCF to the VoLTE IMS network;

and the first signaling message is originated by a user terminal and is transmitted to the MGCF through a border session controller PSBC and a network element call session control function S-CSCF of the VoLTE IMS network.

3. The method of claim 2, wherein the target DTMF transmission mode comprises at least a target voice codec type and a target DTMF media stream sampling frequency supported by the CS network;

when the signaling message is inconsistent with the preset cross-domain dual tone multi-frequency rule, correcting the signaling message to make the signaling message conform to the cross-domain dual tone multi-frequency rule, including:

and if redundant voice coding and decoding types and redundant DTMF media stream sampling frequencies which are inconsistent with the target voice coding and decoding types and the target DTMF media stream sampling frequencies exist in the voice coding and decoding types and the DTMF media stream sampling frequencies carried by the first signaling message, deleting the redundant voice coding and decoding types and the redundant DTMF media stream sampling frequencies in the first signaling message.

4. The method according to claim 2, further comprising, before the detecting the signaling message based on the preset cross-domain dual tone multi frequency rule:

determining the preset cross-domain dual-tone multi-frequency rule at least comprises the following steps:

and pre-configuring and storing the media network element address information of the first target media network element controlled by the CS network and the second target media network element controlled by the MGCF.

5. The method of claim 4, wherein when the signaling message is inconsistent with the preset cross-domain DTMF rule, correcting the signaling message to conform the signaling message to the cross-domain DTMF rule comprises:

if the second signaling message contains the first media address information of the first target media network element, correcting Session Description Protocol (SDP) media information corresponding to the second signaling message to indicate that the first target media network element does not participate in the transmission of the second signaling message;

wherein the second signaling message is that the MGCF receives the last response information containing media address information from the CS network.

6. The method of claim 4, wherein when the signaling message is inconsistent with the preset cross-domain DTMF rule, correcting the signaling message to conform the signaling message to the cross-domain DTMF rule comprises:

and if the third signaling message contains second media network element address information of the second target media network element, correcting Session Description Protocol (SDP) media information corresponding to the third signaling message to indicate that the second target media network element does not participate in the transmission of the third signaling message.

7. The method according to any one of claims 2 to 6, wherein before the detecting the signaling message based on the preset cross-domain DTMF rule, the method further comprises:

according to the first seven characters of the branch in the via header field in the signaling messages from the VoLTE IMS network to the MGCF and from the MGCF to the CS network, and the time information and the calling identification corresponding to the signaling messages, associating the signaling messages from the MGCF to the same session object, and storing the signaling messages corresponding to one session object as one record.

8. A system for implementing a secondary dialing, the system comprising:

a signaling monitoring module, configured to acquire a signaling message to and from a media gateway control function MGCF during a secondary dialing process in which a long term evolution voice-over-lte network and a circuit switching CS network are intercommunicated, where content of the signaling message at least includes dual tone multi-frequency DTMF information, coding and decoding information, and session description protocol SDP media information;

an error correction module, configured to detect the signaling message based on a preset cross-domain dual tone multi-frequency rule, where the preset cross-domain dual tone multi-frequency rule is used to indicate a target DTMF transmission mode supported by the circuit switched CS network and a target media network element that does not participate in media conversion in the signaling message transmission;

and the communication module is used for correcting the signaling message when the signaling message is inconsistent with the preset cross-domain dual tone multi-frequency rule so as to enable the signaling message to accord with the cross-domain dual tone multi-frequency rule.

9. A storage medium having stored thereon a computer program which, when executed by a processor, implements a method of implementing double dialing according to any of claims 1 to 7.

10. An electronic device, comprising:

a processor; and a memory for storing executable instructions of the processor;

wherein the processor is configured to execute the method of implementing secondary dialing of any of claims 1-7 via execution of the executable instructions.