Hi, We had dilemma how to negotiate media capabilities when interworking with ISUP.
We are very appreciated your time to response to us. What we can think of that there are three choices: 1) using OPTIONS ISUP UAC UAS ISUP |------IAM---------->|-----INVITE------------------>| | | |<--------100--------------------| | | | | | | |<--------OPTIONS ----------| | | | | | | |---------200 OK ------------->|---------IAM------>| | | | | |<-----ACM---------|<--------180 - -----------------|<-------ACM-------| | | | | |<----ANM----------|<--------200 OK ------------- |<-------ANM-------| 2) using reliable provisional response ISUP UAC UAS ISUP |------IAM---------->|-----INVITE------------------>| | | |<--------100--------------------| | | | | | | |<--------183 -------------------| | | |----------PRACK------------>| | | |<-------200 OK --------------|---------IAM------>| | | | | |<-----ACM---------|<--------180 - -----------------|<-------ACM-------| | | | | |<----ANM----------|<--------200 OK ------------- |<-------ANM-------| 3) No 183 arrived. ISUP UAC UAS ISUP |------IAM---------->|-----INVITE------------------>| | | |<--------100--------------------| | | | |-------IAM--------->| | |<--------180 -------------------|<------ACM--------| | |----------PRACK------------>| | | |<-------200 OK --------------| | | | | | |<-----ACM (??)--| | | | | | |<----ANM----------|<--------200 OK ------------- |<-------ANM-------| Questions: Are they all valid call flow? any pros and cons? Thanks very much, Best Regards, Helen Luo [EMAIL PROTECTED] _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
