What is the header field that is changed in all re-INVITEs. What is the value of this header field in each scenario?
________________________________ From: Srinivas [mailto:[EMAIL PROTECTED] Sent: Wed 1/16/2008 7:00 PM To: [email protected] Subject: [Sip] regarding session modification Hi all, Consider the following scenarios. 1. C->S: INVITE (for speechrecog) S->C: 200 OK C->S: ACK Now the SIP session is established b/w UAC and UAS. speechrecog resource is active on the established sip session C->S: INVITE (re-INVITE for adding speechsynth resource) S->C: 200 OK Offer/Answer fail for the new resource, TTS (speechsynth). 2. C->S: INVITE (for speechrecog) S->C: 200 OK C->S: ACK Now the SIP session is established b/w UAC and UAS. speechrecog resource is active on the established sip session. C->S: INVITE (re-INVITE for adding speechsynth resource) S->C: 200 OK Offer/Answer fail for the for the existing ASR(speechrecog) resource also. 3. C->S: INVITE (for speechrecog) S->C: 200 OK C->S: ACK Now the SIP session is established b/w UAC and UAS. speechrecog resource is active C->S: INVITE (re-INVITE for adding speechsynth resource) S->C: 200 OK C->S: ACK Now both speechrecog and speechsynth are active on the sip session C->S: INVITE (re-INVITE for removing speechsynth resource) S->C: 486 BUSY HERE What should be the behaviour of UAC in the above scenarios? Regds, Srinivas
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