Usama,
The ACK completes the INVITE dialog and should be sent for all of the responses below - section 17.1.1 of RFC 3261. The UAS in the Invite dialog will continue to resend the final response at T1 until T2 or it receives and ACK.
Regards,
Wayne Davies
| "MANSOOR Usama FTRD/DMR/LON" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED] 22/05/2004 02:36 AM
|
To: <[EMAIL PROTECTED]> cc: Subject: [Sip-implementors] Do all response classes (2xx/3xx/4xx/5xx/6xx) for an INVITE require an ACK? |
Hi all,
I'm looking at the call flows in RFC 3665 and it shows that 200, 302, 407, 480, 486 and 487 responses to an INVITE receive an ACK. Is this true for all 2xx/3xx/4xx/5xx/6xx responses to an invite? Is an ACK always sent when a UA receives a 2xx/3xx/4xx/5xx/6xx for an INVITE it has sent?
- Usama
Usama Mansoor,
France Telecom R&D UK Ltd.
Chiswick Park,
Building 3,
566 Chiswick High Road,
London,
W4 5YA
Tel.: +44 20 8849 5858
Fax.: +44 20 8849 0991
Email: [EMAIL PROTECTED]
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