Hi,
1. As per RFC 3261, a 101-199 response may or may not contain a "To" tag.
Section 13.2.2.1 of RFC 3261 says the following:
" The early dialog will only be needed if the UAC needs to send a
request to its peer within the dialog before the initial INVITE
transaction completes."
Since PRACK to 101-199 is sent before the INVITE transaction completes, does
this mean that, to support the Reliable Provisional Response RFC (RFC 3262),
the 101-199 responses MUST always contain the To tag?
2. The second query is related to error response to PRACK. What is the
meaning of 3xx-6xx response to PRACK? If a PRACK receives a 3xx-6xx
response, what should happen to the INVITE transaction?
3. If a UAC receives a 2xx to INVITE before receiving 2xx to a PRACK, should
the UAC accept the 2xx to INVITE?
UAC UAS
----- INVITE ------------->
<------ 180 --------------
------- PRACK ----------->
<------- 2xx (INVITE) ------
Should the 2xx to INVITE be accepted in the above case?
Regards,
Udaya
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