Make sure you don'y just take quotes without looking
at what was written before:
When in either the "Calling" or "Proceeding" states, reception of a
response with status code from 300-699 MUST cause the client
transaction to transition to "Completed". The client transaction
MUST pass the received response up to the TU, and the client
transaction MUST generate an ACK request, even if the transport is
reliable (guidelines for constructing the ACK from the response are
given in Section 17.1.1.3) and then pass the ACK to the transport
layer for transmission. The ACK MUST be sent to the same address,
port, and transport to which the original request was sent. The
client transaction SHOULD start timer D when it enters the
"Completed" state, with a value of at least 32 seconds for unreliable
transports, and a value of zero seconds for reliable transports.
Timer D reflects the amount of time that the server transaction can
remain in the "Completed" state when unreliable transports are used.
This is equal to Timer H in the INVITE server transaction, whose
Rosenberg, et. al. Standards Track [Page 126]
The sentence "The ACK MUST be sent to the same address, port, and
transport to
which the original request was sent" refers to 3xx-6xx responses.
For 2xx responses, the ACK can be sent directly to the Contact
(provided there is no "route set").
atlanta.com . . . biloxi.com
. proxy proxy .
. .
Alice's . . . . . . . . . . . . . . . . . . . . Bob's
softphone SIP Phone
| | | |
| INVITE F1 | | |
|--------------->| INVITE F2 | |
| 100 Trying F3 |--------------->| INVITE F4 |
|<---------------| 100 Trying F5 |--------------->|
| |<-------------- | 180 Ringing F6 |
| | 180 Ringing F7 |<---------------|
| 180 Ringing F8 |<---------------| 200 OK F9 |
|<---------------| 200 OK F10 |<---------------|
| 200 OK F11 |<---------------| |
|<---------------| | |
| ACK F12 |
|------------------------------------------------->|
| Media Session |
|<================================================>|
| BYE F13 |
|<-------------------------------------------------|
| 200 OK F14 |
|------------------------------------------------->|
| |
Figure 1: SIP session setup example with SIP trapezoid
Regards,
Attila
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Vivek Gupta
Sent: 05 June 2008 11:11
To: [email protected]
Subject: [Sip-implementors] FW: Change of transport type in 2XX response
-----Original Message-----
From: Vivek Gupta
Sent: Thursday, June 05, 2008 3:32 PM
To: '[EMAIL PROTECTED]'
Subject: RE: [Sip-implementors] Change of transport type in 2XX response
Following is the text from RFC 3261 [page 126]:
The ACK MUST be sent to the same address, port, and transport to which
the original request was sent.
-----Original Message-----
From: srinivas [mailto:[EMAIL PROTECTED]
Sent: Thursday, June 05, 2008 1:57 PM
To: Vivek Gupta
Subject: RE: [Sip-implementors] Change of transport type in 2XX response
UAC has to send the ACK to contact address which it has received in 200
OK response for the Invite request.
Thanks & Regards,
Srinivas CH,
Huawei Technologis India Pvt Ltd,
7th Floor Leela Palace,
Airport Road, Bangalore-8,
Contact: (Off) 080-41117676 ext: 7023 (Mob)
+919731316362.
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-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Vivek Gupta
Sent: Thursday, June 05, 2008 12:29 PM
To: [email protected]
Subject: [Sip-implementors] Change of transport type in 2XX response
Hi,
Say, the UAS changes its contact details in the contact header of 200 OK
response to an initial INVITE. Shall UAC send out the ACK to the
original contact to which the initial INVITE was sent or to the updated
contact address?
With regards,
Vivek Gupta
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