Hi Vikram,
The 2xx response and its ACK receive special treatment. This
response is retransmitted only by a UAS, and its ACK generated only
by the UAC. This end-to-end treatment is needed so that a caller
knows the entire set of users that have accepted the call.
In the case of an INVITE transaction, it absorbs the ACK
request for any final response excepting a 2xx response.
Regards,
Thangarajan.
FlextronicsSoftware
Worlds largest SIP stack vendor
"VikramB"
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[Sip-implementors] sip transcation
query
01/10/2006 09:20
AM
Hello All,
In rfc 3261 section 6 Definition
SIP Transaction :
....
.....
If the request is INVITE and the final
response is a non-2xx, the transaction also
includes an ACK to the response. The ACK for a 2xx response to an
INVITE request is a separate transaction.
My query is why ACK is considered as a part of same transaction when in
case of non-2xx response.?
regards
VIkram
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