CN101194483B - Media switching realization method in voice service of H.323 protocol - Google Patents

Media switching realization method in voice service of H.323 protocol Download PDF

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Publication number
CN101194483B
CN101194483B CN200580050011.XA CN200580050011A CN101194483B CN 101194483 B CN101194483 B CN 101194483B CN 200580050011 A CN200580050011 A CN 200580050011A CN 101194483 B CN101194483 B CN 101194483B
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mentioned
medium
switch control
message
control appliance
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CN101194483A (en
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吴巧霞
潘永东
樊高峰
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1106—Call signalling protocols; H.323 and related

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Abstract

A method for implementing the media switch in the voice service of the H.323 protocol of the present invention ,in which the process of the media switch is initiated by the softswitch control equipment, the type of the media switch is the voice media and the switched terminal is the H.323 terminal, performs the flow of the media switch corporately needed in a plurality of the value added service by the negotiation of the H.245 media control signaling, and in the media negotiation, it performs the media negotiation using the virtual media in the case that it does not know the partner media. It applies the media switch of fastly calling and slowly calling user without the influence of the type of the interconnected procotol, and applies the case of the media switch needed in a plurality of the implementation of value added service.

Description

The implementation method that medium in a kind of speech business of H.323 agreement switch
Technical field
The invention belongs to data communication field, relate in a kind of soft switchcall server the implementation method that the medium of agreement H.323 switch, and be particularly related to the implementation method that the medium in a kind of speech business of H.323 agreement switch.
Background technology
Next generation network (Next Generation Network, be called for short the NGN network) and soft switchcall server a large amount of colourful value-added services is provided on the basis of black phone speech business, wherein H.323 agreement when realizing these value-added services, the media channel that needs the temporary close terminal to open is originally often arranged, and with its media transfer situation of (first-class such as the media server that voice service is provided) to new end points.
H.450.X serial protocols is by being encapsulated in relevant H.225 H450.1 supplementary service (H450.1SupplementaryService) Application Protocol Data Unit (the Application ProtocolData Unit of call-signaling message, be called for short APDU) and a series of signaling procedures of its definition finish value-added service and reach the medium handoff procedure that relates to therebetween, but H.450.X the application of serial protocols is to every kind of service needed definition one cover flow process, and need terminal and control appliance all to support H.450.X agreement, more complicated.
At present, H.323 the H.245 agreement in the protocol family is the medium control protocols, can finish media negotiation between end points by process H.245.H.323 agreement V2 version has been introduced the notion of short calling again, allows to finish media negotiation by short calling (faststart) unit in call setup.H.323 introduce third party's heavy-route and terminal capability in the agreement V2 version simultaneously and set the use of empty (Terminal Capability Set NULL) (hereinafter to be referred as TCSNULL) message.
Summary of the invention
In view of above-mentioned, problem to be solved by this invention is how to use the media negotiation of the control of medium H.245 signaling definition to finish the medium switching flow that needs jointly in all kinds of value-added services, and considers to call out fast, at a slow speed the influence that protocol media is H.323 switched.
For this reason, the implementation method that the object of the present invention is to provide the medium in a kind of speech business of H.323 agreement to switch, it is by the H.245 negotiation of medium control signaling, finish the medium of communication terminal and transfer to new end points from former end points, realize the medium handoff procedure that requires in the various value-added services flexibly, easily, also considered short calling and calling procedure and stride the influence of protocol interconnection at a slow speed simultaneously the medium handoff procedure.
For achieving the above object, the implementation method that medium in the speech business of a kind of H.323 agreement of the present invention switch, be applicable to the caller of short calling type, wherein this medium handoff procedure is initiated by the soft switch control appliance, the type that medium switch is a voice medium, and be switched terminal and be terminal H.323, this method may further comprise the steps:
Step 1: caller sends startup (setup) message of band caller medium to the soft switch control appliance;
Step 2: because some service needed shields the Media Stream that is called into caller before called off-hook, then above-mentioned soft switch control appliance can be constructed false medium, and to startup (setup) message of called transmission with false medium;
Step 3: above-mentioned soft switch control appliance by preceding turn to above-mentioned caller send not with the medium of ring (alerting) message of medium and band media server be connected (connect) message, and put calling tone to above-mentioned caller by RTP (Real-time Transport Protocol) (hereinafter to be referred as RTP);
Step 4: above-mentioned called off-hook sends connection (connect) message to above-mentioned soft switch control appliance;
Step 5: above-mentioned soft switch control appliance judges whether above-mentioned connection (connect) message has called medium, if above-mentioned called be quick type, execution in step 7 then are described; Otherwise, above-mentioned called be type at a slow speed, execution in step 6 are described;
Step 6: above-mentioned soft switch control appliance and above-mentioned called both sides carry out media negotiation by process H.245, and above-mentioned soft switch control appliance obtains called medium;
Step 7: above-mentioned soft switch control appliance switches to above-mentioned caller medium above-mentioned called by the control of medium H.245 signaling;
Step 8: above-mentioned soft switch control appliance switches to above-mentioned caller by the control of medium H.245 signaling with above-mentioned called medium.
Step 9: above-mentioned caller and above-mentioned incoming call.
Wherein, in above-mentioned steps 6, the media negotiation that above-mentioned soft switch control appliance and above-mentioned called both sides are undertaken by process H.245 is for using above-mentioned false medium and the above-mentioned called media negotiation that carries out.
In addition, before carrying out above-mentioned steps 7, also need carry out following steps:
Above-mentioned caller and above-mentioned soft switch control appliance carry out successively that two-way principal and subordinate determines and capabilities exchange, and above-mentioned caller and above-mentioned soft switch control appliance both sides all can receive the other side's affirmation message.
And, when being quick type, before carrying out above-mentioned steps 8, also need carry out following steps when called:
Above-mentioned called and above-mentioned soft switch control appliance carries out two-way principal and subordinate successively to be determined and capabilities exchange, and above-mentioned called and above-mentioned soft switch control appliance both sides all can receive the other side's affirmation message.
Further, above-mentioned steps 7 mainly comprises the steps:
Step 701: above-mentioned soft switch control appliance sends request type (RequestMode) message of the medium type after band switches to above-mentioned caller;
Step 702: after above-mentioned request type (RequestMode) message is received in above-mentioned caller, reply request type to above-mentioned soft switch control appliance and confirm (RequestModeAck) message;
Step 703: above-mentioned caller and above-mentioned soft switch control appliance are closed logical channel (CloseLogicalChannel) message and are closed logical channel and confirm that (CloseLogicalChannelAck) message closes the media channel of opening separately by two-way;
Step 704: above-mentioned caller and above-mentioned soft switch control appliance are opened logical channel (OpenLogicalChannel) message and are opened logical channel and confirm that (OpenLogicalChannelAck) message opens required media channel by two-way.
Further, above-mentioned steps 8 mainly comprises the steps:
Step 801: above-mentioned soft switch control appliance is set empty (TerminalCapabilitySetNULL) message to above-mentioned called transmission terminal capability;
Step 802: above-mentioned called receive that above-mentioned terminal capability is set empty (TerminalCapabilitySetNULL) message after, reply terminal capability setting check (TerminalCapabilitySetAck) message to above-mentioned soft switch control appliance;
Step 803: above-mentioned called and above-mentioned soft switch control appliance cuts out logical channel (CloseLogicalChannel) message and cuts out logical channel and confirm that (CloseLogicalChannelAck) message closes the media channel of opening separately by two-way;
Step 804: above-mentioned soft switch control appliance is received above-mentioned terminal capability setting check (TerminalCapabilitySetAck) message, and after confirming that above-mentioned media channel is closed fully, the non-NULL terminal capability of the medium type after above-mentioned called transmission band switches is set (TerminalCapabilitySet) message;
Step 805: above-mentioned called receive that above-mentioned non-NULL terminal capability is set (TerminalCapabilitySet) message after, finish the bi-directional capability exchange process with above-mentioned soft switch control appliance, and reply non-NULL terminal capability setting check (TerminalCapabilitySetAck) message to above-mentioned soft switch control appliance;
Step 806: after above-mentioned soft switch control appliance is received non-NULL terminal capability setting check (TerminalCapabilitySetAck) message of above-mentioned called answer, initiate and the above-mentioned called definite and capabilities exchange operation of two-way principal and subordinate of carrying out;
Step 807: above-mentioned called and above-mentioned soft switch control appliance is opened logical channel (OpenLogicalChannel) message and is opened logical channel and confirm that (OpenLogicalChannelAck) message opens required media channel by two-way.
For achieving the above object, the implementation method that medium in the speech business of a kind of H.323 agreement of the present invention switch, be applicable to the caller of type of call at a slow speed, wherein this medium handoff procedure is initiated by the soft switch control appliance, the type that medium switch is a voice medium, and be switched terminal and be terminal H.323, this method may further comprise the steps:
Step 1: caller sends not startup (setup) message with the caller medium to the soft switch control appliance;
Step 2: above-mentioned soft switch control appliance to called transmission not with startup (setup) message of medium;
Step 3: above-mentioned soft switch control appliance by preceding turn to above-mentioned caller send not with ring (alerting) message of medium be not connected (connect) message with the medium of media server;
Step 4: above-mentioned caller and above-mentioned soft switch control appliance both sides carry out media negotiation by process H.245, and above-mentioned caller obtains the medium of above-mentioned media server and listens calling tone by RTP;
Step 5: above-mentioned called off-hook sends not connection (connect) message with called medium to above-mentioned soft switch control appliance;
Step 6: above-mentioned soft switch control appliance is constructed false medium;
Step 7: above-mentioned soft switch control appliance and above-mentioned called both sides carry out media negotiation by process H.245, and above-mentioned soft switch control appliance obtains called medium;
Step 8: above-mentioned soft switch control appliance switches to above-mentioned caller medium above-mentioned called by the control of medium H.245 signaling;
Step 9: above-mentioned soft switch control appliance switches to above-mentioned caller by the control of medium H.245 signaling with above-mentioned called medium;
Step 10: above-mentioned caller and above-mentioned incoming call.
Wherein, in above-mentioned steps 7, the media negotiation that above-mentioned soft switch control appliance and above-mentioned called both sides are undertaken by process H.245 is for using above-mentioned false medium and the above-mentioned called media negotiation that carries out.
Further, above-mentioned steps 8 mainly comprises the steps:
Step 801: above-mentioned soft switch control appliance sends request type (RequestMode) message of the medium type after band switches to above-mentioned caller;
Step 802: after above-mentioned request type (RequestMode) message is received in above-mentioned caller, reply request type to above-mentioned soft switch control appliance and confirm (RequestModeAck) message;
Step 803: above-mentioned caller and above-mentioned soft switch control appliance are closed logical channel (CloseLogicalChannel) message and are closed logical channel and confirm that (CloseLogicalChannelAck) message closes the media channel of opening separately by two-way;
Step 804: above-mentioned caller and above-mentioned soft switch control appliance are opened logical channel (OpenLogicalChannel) message and are opened logical channel and confirm that (OpenLogicalChannelAck) message opens required media channel by two-way.
Further, above-mentioned steps 9 mainly comprises the steps:
Step 901: above-mentioned soft switch control appliance is set empty (TerminalCapabilitySetNULL) message to above-mentioned called transmission terminal capability;
Step 902: above-mentioned called receive that above-mentioned terminal capability is set empty (TerminalCapabilitySetNULL) message after, reply terminal capability setting check (TerminalCapabilitySetAck) message to above-mentioned soft switch control appliance;
Step 903: above-mentioned called and above-mentioned soft switch control appliance cuts out logical channel (CloseLogicalChannel) message and cuts out logical channel and confirm that (CloseLogicalChannelAck) message closes the media channel of opening separately by two-way;
Step 904: above-mentioned soft switch control appliance is received above-mentioned terminal capability setting check (TerminalCapabilitySetAck) message, and after confirming that above-mentioned media channel is closed fully, the non-NULL terminal capability of the medium type after above-mentioned called transmission band switches is set (TerminalCapabilitySet) message;
Step 905: above-mentioned called receive that above-mentioned non-NULL terminal capability is set (TerminalCapabilitySet) message after, finish the bi-directional capability exchange process with above-mentioned soft switch control appliance, and reply non-NULL terminal capability setting check (TerminalCapabilitySetAck) message to above-mentioned soft switch control appliance;
Step 906: after above-mentioned soft switch control appliance is received non-NULL terminal capability setting check (TerminalCapabilitySetAck) message of above-mentioned called answer, initiate and the above-mentioned called definite and capabilities exchange operation of two-way principal and subordinate of carrying out;
Step 907: above-mentioned called and above-mentioned soft switch control appliance is opened logical channel (OpenLogicalChannel) message and is opened logical channel and confirm that (OpenLogicalChannelAck) message opens required media channel by two-way.
Wherein, above-mentioned caller medium comprise media informations such as medium type, caller medium Internet protocol (Internet Protocol) (hereinafter to be referred as IP) address and caller media port that caller supports number at least; For the caller of short calling type, the medium type of above-mentioned false medium is identical with the medium type that above-mentioned caller is supported, and false medium IP address is inaccessible IP address (for example 127.0.0.1), and false media port number can be chosen wantonly; For the caller of type of call at a slow speed, the medium type of false medium comprises various medium types commonly used, and false medium IP address is inaccessible IP address (for example 127.0.0.1), and false media port number can be chosen wantonly; The medium of above-mentioned media server comprise CRBT medium and prompt tone medium at least; The above-mentioned operation of carrying out media negotiation by process H.245 comprises that at least the principal and subordinate determines operation, capabilities exchange operation and opens the media channel operation; Above-mentioned calling tone comprises CRBT and prompt tone at least; Above-mentioned called medium comprise media informations such as the medium type of called support, called medium IP address and called media port number at least.
Further, using different H.245 medium control signalings to carry out medium for compatibility switches, above-mentioned soft switch control appliance can adopt one of above-mentioned two kinds of medium switching flows that are complementary with it by configuration pin to different terminal type or the different terminal nodes etc. that are switched of being switched.
In addition, also available other IN service control appliances of method of the present invention replace above-mentioned soft switch control appliance to initiate above-mentioned medium handoff procedure.
The present invention adopts the control of medium H.245 signaling to finish medium switching flow in the H.323 speech business of agreement, in media negotiation, adopted false medium to finish media negotiation under the situation of unknown the other side's medium, be applicable to short calling and calling party's medium switching at a slow speed, do not striden the influence of protocol type, be can be used for the situation that needs medium to switch in the various value-added services realizations.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and cooperation Figure of description are described in detail below.
Description of drawings
It is the main schematic flow sheet of short calling type that Fig. 1 works as caller for the method for the invention;
Fig. 2 for the method for the invention when caller be the main schematic flow sheet of type of call at a slow speed;
Fig. 3 is the quick CRBT one number service flow process of customer call one number service number H.323 in a preferred embodiment of the present invention, wherein user's off-hook H.323 fast of one number service number binding;
Fig. 4 is the quick CRBT one number service flow process of customer call one number service number H.323 in a preferred embodiment of the present invention, wherein user's off-hook H.323 at a slow speed of one number service number binding;
Fig. 5 is the CRBT one number service flow process of customer call one number service number H.323, the wherein H.323 user off-hook of one number service binding at a slow speed in a preferred embodiment of the present invention.
Embodiment
One number service allows a plurality of terminal uses to be bundled on the same one number service number, when this one number service number of certain customer call, the ring simultaneously of a plurality of user bounds is behind wherein some ring user off-hooks, call through between this off-hook user and caller discharges other-end user's calling.
Below in conjunction with the specific implementation step of one number service at the implementation procedure explanation H.323 protocol media changing method of the present invention of protocol side H.323.Wherein, the calling and called user may not be the user under the same soft switch, also may cross over other protocol types and other control appliances in the call path, and the present invention mainly pays close attention to the H.323 signaling process of protocol side.For convenience of explanation, the IP address of calling and called and the medium type of use etc. are all specialized among the embodiment, but do not represent that the present invention is subject to these contents.In order to use less embodiment to cover the process of the inventive method, select typical example for use, and calling and called adopt different H.245 signaling switch steps, and the medium of using in other value-added services switch can use medium changing method of the present invention equally.
It is the main schematic flow sheet of short calling type that Fig. 1 works as caller for the method for the invention, Fig. 3 is the quick H.323 one number service flow process of customer call one number service number in a preferred embodiment of the present invention, wherein user's off-hook H.323 fast of one number service binding is put CRBT by media server to caller.Please be simultaneously with reference to Fig. 1 and Fig. 3, it mainly may further comprise the steps:
Step 101, caller send to the soft switch control appliance and start (setup) message, wherein these message band caller medium;
Step 102 and step 103, above-mentioned soft switch control appliance sends startups (setup) message to a plurality of called subscribers of one number service binding, false medium of this message band wherein, but medium type is with the medium type of caller support;
Step 104 and step 105, above-mentioned a plurality of called while rings;
Step 106, above-mentioned soft switch control appliance sends ring (alerting) message to above-mentioned caller;
Step 107, above-mentioned soft switch control appliance send to above-mentioned caller and connect (connect) message, the wherein wounded bell medium of this message, the i.e. medium of media server;
Step 108, above-mentioned caller is listened CRBT by RTP, and selected speech media type is G711A;
Step 109, above-mentioned called off-hook, selected speech media type is G711U;
Step 110, above-mentioned soft switch control appliance discharge other called subscribers and call out;
Step 111, use H.245 medium control signaling to switch the caller medium before, above-mentioned caller and above-mentioned soft switch control appliance carry out two-way principal and subordinate to be determined, both sides need the principal and subordinate who receives the other side to determine to confirm (MasterSlaveDeterminationAck) message;
Step 112, before using H.245 medium control signaling to switch the caller medium, above-mentioned caller and above-mentioned soft switch control appliance carry out two-way capabilities exchange, and both sides need to receive the other side's terminal capability setting check (TerminalCapabilitySetAck) message;
Step 113, above-mentioned soft switch control appliance send request type (RequestMode) message to above-mentioned caller and switch the caller medium, and wherein the medium type of Qie Huaning is called medium G711U;
After step 114, above-mentioned caller are received above-mentioned request type (RequestMode) message, reply request type to above-mentioned soft switch control appliance and confirm (RequestModeAck) message;
Step 115, the voice medium passage that above-mentioned caller and above-mentioned each self closing we of soft switch control appliance both sides open;
Step 116, above-mentioned caller and above-mentioned soft switch control appliance both sides open new voice medium passage, and wherein medium type is G711U, and above-mentioned caller this moment has obtained called medium, can be to above-mentioned called transmission RTP voice packet;
Step 117, use H.245 medium control signaling to switch called medium before, above-mentioned called and above-mentioned soft switch control appliance carries out two-way principal and subordinate to be determined, both sides need the principal and subordinate who receives the other side to determine affirmation (MasterSlaveDeterminationAck) message;
Step 118, before using H.245 medium control signaling to switch called medium, above-mentioned called and above-mentioned soft switch control appliance carries out two-way capabilities exchange, and both sides need to receive the other side's terminal capability setting check (TerminalCapabilitySetAck) message;
Step 119, above-mentioned soft switch control appliance is set empty (TerminalCapabilitySetNULL) message to above-mentioned called transmission terminal capability, to suspend called medium;
Step 120, above-mentioned called to above-mentioned soft switch control appliance answer terminal capability setting check (TerminalCapabilitySetAck) message;
Step 121, all media channels that above-mentioned called and above-mentioned each self closing we of soft switch control appliance both sides open;
Step 122, above-mentioned soft switch control appliance is received above-mentioned called terminal capability setting check (TerminalCapabilitySetAck) message, and after confirming that original all media channels all are closed, set (TerminalCapabilitySet) message to above-mentioned called transmission non-NULL terminal capability, wherein this message comprises that the current medium type of caller is G711U;
Step 123, above-mentioned called to above-mentioned soft switch control appliance answer terminal capability setting check (TerminalCapabilitySetAck) message;
Step 124, above-mentioned called and above-mentioned soft switch control appliance are carried out two-way principal and subordinate again and are determined;
Step 125, above-mentioned called to above-mentioned soft switch control appliance transmission terminal capability setting (TerminalCapabilitySet) message, wherein this message comprises the medium type of above-mentioned called support;
Step 126, above-mentioned soft switch control appliance is to above-mentioned called answer terminal capability setting check (TerminalCapabilitySetAck) message;
Step 127, above-mentioned called and above-mentioned soft switch control appliance is opened new voice medium passage, and wherein medium type is G711U, at this moment above-mentioned called acquisition caller medium;
Step 128, above-mentioned calling and called conversation.
Fig. 4 is the quick one number service flow process of customer call one number service number H.323 in a preferred embodiment of the present invention, and wherein user's off-hook H.323 at a slow speed of one number service binding is put CRBT by media server to caller.Please be simultaneously with reference to Fig. 1 and Fig. 4, it mainly may further comprise the steps:
Step 201 to step 208 with step 101 to step 108, CRBT is listened in caller;
Step 209, called off-hook sends connection (connect) message to the soft switch control appliance, and wherein this message is not with called medium;
Step 210, above-mentioned called and above-mentioned soft switch control appliance are carried out two-way principal and subordinate and are determined;
Step 211, above-mentioned called and above-mentioned soft switch control appliance carries out two-way capabilities exchange;
Step 212, above-mentioned called and above-mentioned soft switch control appliance both sides open the voice medium passage, and wherein medium type is G711U;
Step 213, above-mentioned soft switch control appliance discharge other called subscribers and call out;
Step 214 to step 219 with step 111 to step 116, the caller medium switch to called from media server;
Step 220 arrives step 127 to step 228 with step 119, and called medium switch to caller from false medium;
Step 229, above-mentioned calling and called conversation.
Fig. 2 for the method for the invention when caller be the main schematic flow sheet of type of call at a slow speed, Fig. 5 is the one number service flow process of customer call one number service number H.323 at a slow speed in a preferred embodiment of the present invention, wherein the H.323 user off-hook of one number service binding is put CRBT by media server to caller.Please be simultaneously with reference to Fig. 2 and Fig. 5, it mainly may further comprise the steps:
Step 301, caller send to the soft switch control appliance and start (setup) message, and wherein this message is not with the caller medium;
Step 302 and step 303, above-mentioned soft switch control appliance sends initiation message (setup) message to a plurality of called subscribers of one number service binding, and wherein this message is not with medium;
Step 304 and step 305, above-mentioned a plurality of called while rings;
Step 306, above-mentioned soft switch control appliance sends ring (alerting) message to above-mentioned caller;
Step 307, above-mentioned soft switch control appliance send to above-mentioned caller and connect (connect) message;
Step 308, above-mentioned caller and above-mentioned soft switch control appliance are carried out two-way principal and subordinate and are determined;
Step 309, above-mentioned caller and above-mentioned soft switch control appliance carry out two-way capabilities exchange, and the terminal capability that wherein above-mentioned soft switch control appliance sends is set the medium type that (TerminalCapabilitySet) message comprises the media server that is used to put CRBT;
Step 310, above-mentioned caller and above-mentioned soft switch control appliance both sides open the voice medium passage, and wherein selected medium type is G711A;
Step 311, CRBT is listened in above-mentioned caller;
Step 312, above-mentioned called off-hook sends connection (connect) message to above-mentioned soft switch control appliance, and wherein this message is not with medium;
Step 313, above-mentioned called and above-mentioned soft switch control appliance are carried out two-way principal and subordinate and are determined;
Step 314, above-mentioned called and above-mentioned soft switch control appliance carries out two-way capabilities exchange, and the terminal capability that wherein above-mentioned soft switch control appliance sends is set (TerminalCapabilitySet) message and is comprised various medium types commonly used;
Step 315, above-mentioned called and above-mentioned soft switch control appliance both sides open the voice medium passage, and wherein selected medium type is G711U;
Step 316, above-mentioned soft switch control appliance discharge other called subscribers and call out;
Step 317, after the media information such as all medium types, IP address, media port number for the treatment of above-mentioned called support is sent to above-mentioned soft switch control appliance Calling Side, above-mentioned soft switch control appliance sends request type (RequestMode) message and switches the caller medium, and the medium type in wherein above-mentioned request type (RequestMode) message is the common a kind of medium type G711A that support of the selected calling and called of above-mentioned soft switch control appliance;
Step 318, above-mentioned caller are replied request type to above-mentioned soft switch control appliance and are confirmed (RequestModeAck) message;
Step 319, the voice medium passage that above-mentioned caller and above-mentioned each self closing we of soft switch control appliance both sides open;
Step 320, above-mentioned caller and above-mentioned soft switch control appliance both sides open new voice medium passage, and wherein medium type is G711A, and above-mentioned caller this moment has obtained called medium, can be to above-mentioned called transmission RTP voice packet;
Step 321 arrives step 127 to step 329 with step 119, and called medium switch to caller from false medium;
Step 330, above-mentioned calling and called conversation.
More than describe operation principle of the present invention in detail, but the example of this visualization of just lifting for the ease of understanding should not be considered to be limitation of the scope of the invention.Equally, according to the description of technical scheme of the present invention and preferred embodiment thereof, can make various possible being equal to and change or replacement, and all these changes or replacement all should belong to the protection range of claim of the present invention.

Claims (14)

1. implementation method of switching of the medium in the speech business of agreement H.323, caller is the short calling type, it is characterized in that medium handoff procedure wherein initiated by the soft switch control appliance, the type that medium switch is a voice medium, and be switched terminal and be terminal H.323, this method may further comprise the steps:
Step 1: caller sends startup (setup) message of band caller medium to the soft switch control appliance;
Step 2: above-mentioned soft switch control appliance is constructed false medium, and to startup (setup) message of called transmission with false medium;
Step 3: above-mentioned soft switch control appliance by preceding turn to above-mentioned caller send not with the medium of ring (alerting) message of medium and band media server be connected (connect) message, and put calling tone to above-mentioned caller by RTP;
Step 4: above-mentioned called off-hook sends connection (connect) message to above-mentioned soft switch control appliance;
Step 5: above-mentioned soft switch control appliance judges whether above-mentioned connection (connect) message has called medium, if above-mentioned called be quick type, execution in step 7 then are described; Otherwise, above-mentioned called be type at a slow speed, execution in step 6 are described;
Step 6: above-mentioned soft switch control appliance and above-mentioned called both sides carry out media negotiation by process H.245, and wherein said media negotiation is for using above-mentioned false medium and the above-mentioned called media negotiation that carries out, and above-mentioned soft switch control appliance obtains called medium;
Step 7: above-mentioned caller and above-mentioned soft switch control appliance carry out successively that two-way principal and subordinate determines and capabilities exchange, and above-mentioned caller and above-mentioned soft switch control appliance both sides all can receive the other side's affirmation message; Above-mentioned soft switch control appliance switches to above-mentioned caller medium above-mentioned called by the control of medium H.245 signaling;
Step 8: above-mentioned soft switch control appliance switches to above-mentioned caller by the control of medium H.245 signaling with above-mentioned called medium;
When called when being quick type, also need execution in step before the above-mentioned steps 8: above-mentioned called and above-mentioned soft switch control appliance carries out two-way principal and subordinate successively to be determined and capabilities exchange, and above-mentioned called and above-mentioned soft switch control appliance both sides all can receive the other side's affirmation message.
2. method according to claim 1 is characterized in that
Above-mentioned caller medium comprise medium type, caller medium internet protocol address and the caller media port information that caller is supported at least;
The medium type of above-mentioned false medium is identical with the medium type that above-mentioned caller is supported, and false medium internet protocol address is inaccessible internet protocol address, and false media port is number optional;
The medium of above-mentioned media server comprise CRBT medium and prompt tone medium at least;
The above-mentioned operation of carrying out media negotiation by process H.245 comprises that at least the principal and subordinate determines operation, capabilities exchange operation and opens the media channel operation;
Above-mentioned calling tone comprises CRBT and prompt tone at least;
Above-mentioned called medium comprise medium type, called medium internet protocol address and the called media port information of called support at least.
3. method according to claim 1 and 2 is characterized in that above-mentioned steps 7 mainly comprises the steps:
Step 701: above-mentioned soft switch control appliance sends request type (RequestMode) message of the medium type after band switches to above-mentioned caller;
Step 702: after above-mentioned request type (RequestMode) message is received in above-mentioned caller, reply request type to above-mentioned soft switch control appliance and confirm (RequestModeAck) message;
Step 703: above-mentioned caller and above-mentioned soft switch control appliance are closed logical channel (CloseLogicalChannel) message and are closed logical channel and confirm that (CloseLogicalChannelAck) message closes the media channel of opening separately by two-way;
Step 704: above-mentioned caller and above-mentioned soft switch control appliance are opened logical channel (OpenLogicalChannel) message and are opened logical channel and confirm that (OpenLogicalChannelAck) message opens required media channel by two-way.
4. method according to claim 1 and 2 is characterized in that above-mentioned steps 8 mainly comprises the steps:
Step 801: above-mentioned soft switch control appliance is set empty (TerminalCapabilitySetNULL) message to above-mentioned called transmission terminal capability;
Step 802: above-mentioned called receive that above-mentioned terminal capability is set empty (TerminalCapabilitySetNULL) message after, reply terminal capability setting check (TerminalCapabilitySetAck) message to above-mentioned soft switch control appliance;
Step 803: above-mentioned called and above-mentioned soft switch control appliance cuts out logical channel (CloseLogicalChannel) message and cuts out logical channel and confirm that (CloseLogicalChannelAck) message closes the media channel of opening separately by two-way;
Step 804: above-mentioned soft switch control appliance is received above-mentioned terminal capability setting check (TerminalCapabilitySetAck) message, and after confirming that above-mentioned media channel is closed fully, the non-NULL terminal capability of the medium type after above-mentioned called transmission band switches is set (TerminalCapabilitySet) message;
Step 805: above-mentioned called receive that above-mentioned non-NULL terminal capability is set (TerminalCapabilitySet) message after, finish the bi-directional capability exchange process with above-mentioned soft switch control appliance, and reply non-NULL terminal capability setting check (TerminalCapabilitySetAck) message to above-mentioned soft switch control appliance;
Step 806: after above-mentioned soft switch control appliance is received non-NULL terminal capability setting check (TerminalCapabilitySetAck) message of above-mentioned called answer, initiate and the above-mentioned called definite and capabilities exchange operation of two-way principal and subordinate of carrying out;
Step 807: above-mentioned called and above-mentioned soft switch control appliance is opened logical channel (OpenLogicalChannel) message and is opened logical channel and confirm that (OpenLogicalChannelAck) message opens required media channel by two-way.
5. method according to claim 3 is characterized in that above-mentioned soft switch control appliance can basis be switched the support situation of terminal to the described medium switching type of step 7, determine whether terminal is carried out medium according to this medium switching flow and switched.
6. method according to claim 4 is characterized in that above-mentioned soft switch control appliance can basis be switched the support situation of terminal to the described medium switching type of step 8, determine whether terminal is carried out medium according to this medium switching flow and switched.
7. method according to claim 1 is characterized in that and can replace above-mentioned soft switch control appliance to initiate above-mentioned medium handoff procedure with other IN service control appliances.
8. implementation method of switching of the medium in the speech business of agreement H.323, caller is type of call at a slow speed, it is characterized in that medium handoff procedure wherein initiated by the soft switch control appliance, the type that medium switch is a voice medium, and be switched terminal and be terminal H.323, this method may further comprise the steps:
Step 1: caller sends not startup (setup) message with the caller medium to the soft switch control appliance;
Step 2: above-mentioned soft switch control appliance to called transmission not with startup (setup) message of medium;
Step 3: above-mentioned soft switch control appliance by preceding turn to above-mentioned caller send not with ring (alerting) message of medium be not connected (connect) message with the medium of media server;
Step 4: above-mentioned caller and above-mentioned soft switch control appliance both sides carry out media negotiation by process H.245, and above-mentioned caller obtains the medium of above-mentioned media server and listens calling tone by RTP;
Step 5: above-mentioned called off-hook sends not connection (connect) message with called medium to above-mentioned soft switch control appliance;
Step 6: above-mentioned soft switch control appliance is constructed false medium;
Step 7: above-mentioned soft switch control appliance and above-mentioned called both sides carry out media negotiation by process H.245, and above-mentioned soft switch control appliance obtains called medium, and wherein said media negotiation is for using above-mentioned false medium and the above-mentioned called media negotiation that carries out;
Step 8: above-mentioned soft switch control appliance switches to above-mentioned caller medium above-mentioned called by the control of medium H.245 signaling;
Step 9: above-mentioned soft switch control appliance switches to above-mentioned caller by the control of medium H.245 signaling with above-mentioned called medium.
9. method according to claim 8 is characterized in that
Above-mentioned caller medium comprise medium type, caller medium internet protocol address and the caller media port information that caller is supported at least;
False medium internet protocol address is inaccessible internet protocol address, and false media port is number optional;
The medium of above-mentioned media server comprise CRBT medium and prompt tone medium at least;
The above-mentioned operation of carrying out media negotiation by process H.245 comprises that at least the principal and subordinate determines operation, capabilities exchange operation and opens the media channel operation;
Above-mentioned calling tone comprises CRBT and prompt tone at least;
Above-mentioned called medium comprise medium type, called medium internet protocol address and the called media port information of called support at least.
10. method according to claim 8 is characterized in that above-mentioned steps 8 mainly comprises the steps:
Step 801: above-mentioned soft switch control appliance sends request type (RequestMode) message of the medium type after band switches to above-mentioned caller;
Step 802: after above-mentioned request type (RequestMode) message is received in above-mentioned caller, reply request type to above-mentioned soft switch control appliance and confirm (RequestModeAck) message;
Step 803: above-mentioned caller and above-mentioned soft switch control appliance are closed logical channel (CloseLogicalChannel) message and are closed logical channel and confirm that (CloseLogicalChannelAck) message closes the media channel of opening separately by two-way;
Step 804: above-mentioned caller and above-mentioned soft switch control appliance are opened logical channel (OpenLogicalChannel) message and are opened logical channel and confirm that (OpenLogicalChannelAck) message opens required media channel by two-way.
11. method according to claim 10 is characterized in that above-mentioned soft switch control appliance can be according to being switched the support situation of terminal to the described medium switching type of step 8, the medium switching flow of selection terminal support carries out medium and switches.
12. method according to claim 8 is characterized in that above-mentioned steps 9 mainly comprises the steps:
Step 901: above-mentioned soft switch control appliance is set empty (TerminalCapabilitySetNULL) message to above-mentioned called transmission terminal capability;
Step 902: above-mentioned called receive that above-mentioned terminal capability is set empty (TerminalCapabilitySetNULL) message after, reply terminal capability setting check (TerminalCapabilitySetAck) message to above-mentioned soft switch control appliance;
Step 903: above-mentioned called and above-mentioned soft switch control appliance cuts out logical channel (CloseLogicalChannel) message and cuts out logical channel and confirm that (CloseLogicalChannelAck) message closes the media channel of opening separately by two-way;
Step 904: above-mentioned soft switch control appliance is received above-mentioned terminal capability setting check (TerminalCapabilitySetAck) message, and after confirming that above-mentioned media channel is closed fully, the non-NULL terminal capability of the medium type after above-mentioned called transmission band switches is set (TerminalCapabilitySet) message;
Step 905: above-mentioned called receive that above-mentioned non-NULL terminal capability is set (TerminalCapabilitySet) message after, finish the bi-directional capability exchange process with above-mentioned soft switch control appliance, and reply non-NULL terminal capability setting check (TerminalCapabilitySetAck) message to above-mentioned soft switch control appliance;
Step 906: after above-mentioned soft switch control appliance is received non-NULL terminal capability setting check (TerminalCapabilitySetAck) message of above-mentioned called answer, initiate and the above-mentioned called definite and capabilities exchange operation of two-way principal and subordinate of carrying out;
Step 907: above-mentioned called and above-mentioned soft switch control appliance is opened logical channel (OpenLogicalChannel) message and is opened logical channel and confirm that (OpenLogicalChannelAck) message opens required media channel by two-way.
13. method according to claim 12 is characterized in that above-mentioned soft switch control appliance can be according to being switched the support situation of terminal to the described medium switching type of step 9, the medium switching flow of selection terminal support carries out medium and switches.
14. method according to claim 8 is characterized in that and can replace above-mentioned soft switch control appliance to initiate above-mentioned medium handoff procedure with other IN service control appliances.
CN200580050011.XA 2005-11-14 2005-11-14 Media switching realization method in voice service of H.323 protocol Expired - Fee Related CN101194483B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
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CN1407445A (en) * 2001-08-24 2003-04-02 华为技术有限公司 Method for realizing interactive answer/speech mailbox facility by software
US6785223B1 (en) * 1999-04-22 2004-08-31 Siemens Information And Communication Networks, Inc. System and method for restarting of signaling entities in H.323-based realtime communication networks

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KR20020021275A (en) * 2000-09-14 2002-03-20 이승우 Audio standard converting system for supporting phone of portable terminal

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US6785223B1 (en) * 1999-04-22 2004-08-31 Siemens Information And Communication Networks, Inc. System and method for restarting of signaling entities in H.323-based realtime communication networks
CN1407445A (en) * 2001-08-24 2003-04-02 华为技术有限公司 Method for realizing interactive answer/speech mailbox facility by software

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