Thinking about it, 200 OK for INVITE has to be end-to-end
and the same goes for the ACK.
One reason for this is that the INVITE could've been sent
without SDP and then the 200 OK could have SDP, in which
case the ACK must also have SDP. Clearly the proxies
could not provide SDP.
Another reason is that when the INVITE has SDP and there
is SDP in the 200 OK, (strictly) the sender of the 200 has to wait
until the ACK has come back before it starts to send media.
Regards,
Attila
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Fri 15/12/2006 08:29
To: Attila Sipos; [email protected]
Cc:
Subject: RE: [Sip-implementors] Doubt in rfc 3665.
In 3.8, I do believe that reason for hop-by-hop message transfer is
proxies being stateful. But then why in 3.2 200Ok and ACK are not
hop-by-hop. Here when 200Ok reaches Alice phone through proxy 1 and 2
then ACK is sent and new Via is added by each proxy. Why in 3.2, like
3.8, 200Ok and ACK are not exchanged from bob-proxy2, proxy2-proxy 1 and
proxy1-Alice.
Vivek
-----Original Message-----
From: Attila Sipos [mailto:[EMAIL PROTECTED]
Sent: Friday, December 15, 2006 12:30 PM
To: Vivek Srivastava (WT01 - IP-Multimedia Carrier & Ent Networks);
Vivek Srivastava (WT01 - IP-Multimedia Carrier & Ent Networks);
[email protected]
Subject: RE: [Sip-implementors] Doubt in rfc 3665.
Yes, I think you're right here.
What I don't understand is why does the 487/ACK happen hop-by-hop?
And why is the CANCEL/200 hop-by-hop?
Those proxies must be stateful too.
Regards,
Attila
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of
[EMAIL PROTECTED]
Sent: Fri 15/12/2006 05:51
To: [EMAIL PROTECTED]; [email protected]
Cc:
Subject: Re: [Sip-implementors] Doubt in rfc 3665.
Hi All,
Adding to my previous mail the Via header should be
Via: SIP/2.0/UDP
ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1
which is added by proxy1 in F2.
Correct me if I m wrong.
Cheers,
Vivek
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Thursday, December 14, 2006 8:12 PM
To: [email protected]
Subject: [Sip-implementors] Doubt in rfc 3665.
Hi All,
I was going through rfc 3665. In call flow for Unsuccessful no
answer
(3.8), why F16 and F18 has same Via?
Cheers,
Vivek
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