Hi,
Consider the below call scenario.
UAC UAS
| INVITE
|--------------------------------------------------->|
| 401 |
|<---------------------------------------------------|
| ACK |
|--------------------------------------------------->|
| INVITE with credentials |
|---------------------------------------------------->|
| 180 |
|<----------------------------------------------------|
| PRACK |
|---------------------------------------------------->|
Now my queries are:
1) Is it MUST to send the credentials in PRACK?
[RFC 3261 section 22.3 says "If a UA receives a Proxy-Authenticate header
field value in a 401/407 response to a request with a particular
Call-ID, it should incorporate credentials for that realm in all subsequent
requests that contain the same Call-
ID."
But the RFC does not mention what if UAC is challenged with WWW-Authenticate
header]
2) If credentials are not provided in PRACK then can UAS challenge PRACK?
3) If its possible to challenge the PRACK with 401, should the subsequest
PRACK with Authorization credential have the incremented CSeq as compared to
the previous PRACK?
[RFC 3261 section 22.2 says"When a UAC resubmits a request with its
credentials after receiving a 401 (Unauthorized) or 407 (Proxy
Authentication Required) response, it MUST increment the CSeq header field
value as it would normally
when sending an updated request."]
4) How the PRACK transactions be maintained in this case?
Please provide your valuable inputs.
Thanks,
Praveen Dandin
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