RFC An Offer/Answer Model with Session Description Protocol (SDP), June Canonical URL: ; File formats: . Request for Comments This RFC was published in RFC – Key words for use in RFCs to Indicate Requirement Levels · RFC SDP offer and answer model is described in RFC “An Offer/Answer Model with Session Description Protocol (SDP)”. The SDP negotiator is represented.
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The SDP negotiator is ready to negotiate both session descriptors. The purpose of rfc 3264 rcf is to verify remote answer, and update the initial offer according to the answer. Allow media type in the SDP to be changed.
This enumeration describes SDP negotiation state. Register customized SDP format matching callback function for the specified format. This structure contains negotiation state rfc 3264 several Efc session descriptors currently being used in the negotiation. Generating SDP Answer After remote offer has been set in the rfc 3264, rcf can request the SDP negotiator to generate appropriate answer based on local capability.
The declaration of customized SDP format matching callback. For example, it can have more or less media lines than the offer, or their order may be different than the offer.
Initialize the SDP negotiator with remote rfc 3264, and optionally specify the initial local capability, if known.
Get rfc 3264 current remote SDP offer or answer. Returns String description of the state. This specifies rfc 3264 behavior of the SDP negotiator when responding to an offer, whether it should rfd use the codec preference as set by remote, or should it rather use the codec preference as specified by local endpoint.
If zero only a single format will be returned. Pool to allocate memory. Create the SDP 3246 with local offer. Match format in the SDP media offer and answer. As those parameters are format specifics, the negotiation must be done by the format or rfc 3264 implementation. For example, suppose incoming call has codec order “8 rfc 3264 3”, while local codec order is “3 0 8”. Application can only call this 32664 after negotiation has been done, or otherwise there won’t be active SDPs. This specifies the behavior of the SDP negotiator when responding to an offer, whether it should answer with multiple formats or not.
Parameters pool The memory pool.
Get the currently active remote SDP. Modify local session with a new SDP and treat this as a new offer. Rfc 3264 state occurs when SDP negotiator has sent our rfc 3264 to remote and it rfc 3264 waiting for answer. The pool’s lifetime needs to be valid for the duration of the negotiator. After calling this function, application can send the SDP as offer to remote party, using signaling protocol such as SIP.
AMR fmtp ‘octet-align’ field can be adjusted with the offer when the codec implementation support rfc 3264 packetization modes octet-aligned and bandwidth-efficient. Application normally calls this function when it receives initial offer from remote. Parameters pool Pool to allocate memory. Get the state string description of the specified state. Negotiate local and remote answer. 32264 rfc 3264 a new offer, in the case that a media line doesn’t match the active SDP, the new media line will be considered to replace the existing media at the same position.
If non-zero, the negotiator will use the codec order as specified in remote offer. After remote offer has been set in rfc 3264 negotiator, application can request the SDP negotiator to 3624 appropriate answer based on local capability.
Application calls rfc 3264 function when it receives SDP answer from remote. Returns Non-zero if it was remote who sent answer, otherwise zero if it was local who supplied answer. If application does not want send modified offer, it can just send the active local SDP as the offer.
Parameters state Negotiator state. The negotiator is capable to match and reorder local SDP according to remote offer, and create an answer that is suitable for the offer.
The customized SDP format matching is needed when the format identification in a media rfc 3264 session cannot be simply determined by encoding name and clock rate, but also involves one rfc 3264 more format specific parameters, which are specified in SDP fmtp attribute. rfc 3264
RFC – An Offer/Answer Model with Session Description Protocol (SDP)
This state occurs when SDP negotiation has completed, either successfully or not. To unregister the callback of specific format, just call this function with parameter cb rfc 3264 to NULL. If negotiator has initial local capability, application can specify NULL on this argument; in this case, the negotiator will create answer by by negotiating remote offer with initial local capability. The format name, e. Parameters neg The negotiator. Get SDP negotiator state.
If zero, it rgc prefer to use the local codec order. If any rfc 3264 negotiation process was successfull i. Rfc 3264 this stage, application may or may not ready to create an answer.
[SIPForum-discussion] Proper RFC 3264 Hold Behavior in SDP
For example, the initial offer may specify that a stream is sendrecvwhile the answer specifies that remote stream is inactive. Calling this function will not change the state of the negotiator. Determine whether remote rfc 3264 answer as opposed to offer on the rfc 3264 negotiation.
Enumeration of customized SDP format matching option flags. If remote rfc 3264 order is preferable, the selected codec will be 8, while if local codec order is rfc 3264, the selected codec will be 3. This state occurs when an offer either local or remote has been provided with answer.
In this case, both active local and active remote will not be modified.