Early media implementation method and device
An implementation method, an early media technology, applied in the field of communication, can solve problems such as bandwidth waste and poor call quality, and achieve the effect of saving bandwidth resources and avoiding mutual interference
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Example Embodiment
[0100] Example one, such as figure 1 As shown, an early media implementation method provided by an embodiment of the present invention includes:
[0101] Step 101: Send a call request to the call session control function entity P-CSCF, the call request includes the color ring media session description protocol SDP and the session media SDP;
[0102] The above CRBT media SDP includes early media access information supported by the calling terminal, and the above session media SDP includes session media access information supported by the calling terminal; the above CRBT media can be understood as all early media supported by the calling terminal, for example: Fault tone media and other media before the session connection is established. In the subsequent embodiments, the early media supported by the calling terminal is taken as an example of the color ring media, and the early media supported by the called terminal is illustrated by using color image media as an example. The media i...
Example Embodiment
[0110] Example two, such as Figure 2a , Figure 2b , Figure 2c As shown, this embodiment uses IMS as the background, UE supports CRBT and color image services respectively, P-CSCF supports CRBT and color image services respectively, S-CSCF supports CRBT and color image services, and multimedia caller identification server (Multimedia Caller Identification Server) , MCID AS) supports color image service, MRBT AS supports color ring back tone service, including the following steps:
[0111] Step 201: The calling terminal UE initiates an invite (Invite) request (this Invite request is used for a call, which can be called a call request). If the calling UE supports CRBT media, add session media SDP and CRBT media SDP to the Invite request, The calling UE sends an Invite request to the calling P-CSCF determined during the registration process.
[0112] Step 202: The calling P-CSCF can perform local policy check and network address translation (Network Address Translation, NAT) mapping...
Example Embodiment
[0148] Example three, such as Figure 3a , Figure 3b As shown, the difference from the second embodiment is that this embodiment includes a Media Gateway Control Function (MGCF), which supports circuit switching (CS) domain color ring back tone service, which may include the following steps:
[0149] Step 301: The calling UE initiates an Invite request (or call request). If the calling UE supports CRBT media, add session media SDP and CRBT media SDP to the request, and the calling UE will report to the caller P determined during the registration process. -CSCF sends an Invite request.
[0150] Step 302: The calling P-CSCF can perform local policy check and NAT mapping conversion on the session media SDP and the CRBT media SDP respectively. The calling P-CSCF sends an Invite request to the calling S-CSCF determined during the registration process, and the calling The S-CSCF triggers the Invite request to the calling MCID AS.
[0151] Step 303: The MCID AS judges whether the calling ...
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