According to RFC 3261: Early Dialog can be terminate sending by BYE or CANCEL for UAC side. In case of CANCEL we should send 487 for INVITE
UAC UAS ---------INVITE---------------------> < ---------180---------------------- ----------CANCEL----------- > < ---------200 CANCEL------- < -----------487 --------------- ------------ACK 487-----------> But in the of BYE: UAC UAS -------INVITE-----------------> < ---------180----------------- ----------BYE ---------------- > < ---------200 BYE ----------- <--(what should be send)----- (503 or 487) ------------ACK -------------> So in the case of sending BYE by UAC , UAS should send 503 or 487 for INVITE. Thanks, Pravin _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
