From: varun <[EMAIL PROTECTED]> 1> In what cases should 180 be definitely be send as a response.
If the UAS genuinely alerts a user and has to wait for the user to accept the call, it should send 180 when alerting starts. But some UASs (e.g., voice mail systems) are automated and do not need to wait for user action, and so there is no need to send 180, as 200 will follow immediately. How are 180 and 183 different from each other? The important difference is that 180 asserts that alerting has started at the UAS. 183 indicates that the call is being processed (by some entity), but does not imply that a destiantion is being alerted. 3>coming to early media, once the caller has send an invite it is ready to receive media( you can play announcements to the caller), what has 183 got to do with early media? "once the caller sent an INVITE containing SDP" (It is possible to send an INVITE without SDP.) Dale _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
