[Serusers] r-uri for ACK

[Jiri Kuthan]

At 04:39 AM 10/18/2004, Richard wrote:
>Hi Jiri,
>
>If I have record-route, ACK to a 200 OK should be forwarded loose route. But
>for an ACK to negative reply, e.g. 487, it uses the original r-uri.

sure

> Because
>ACK to negative reply is hop-by-hop basis, ser should absorb the ACK and
>won't forward it further, right?

indeed

> In ser.cfg, should we just drop it in case
>ser doesn't absorb it? 

SER absorbs it either in t_relay if the reply was generated statefully or
even before enterint the script if reply was generated statellsy.

-jiri

>Downstream won't understand the ACK anyway and might
>be screw up any existing call...
>
>Richard
>
>
>> -----Original Message-----
>> From: Jiri Kuthan [mailto:jiri at iptel.org]
>> Sent: Thursday, October 14, 2004 12:33 AM
>> To: Richard; serusers at lists.iptel.org
>> Subject: Re: [Serusers] r-uri for ACK
>> 
>> It depends. ACK for negative replies must have identical URIs as INVITEs.
>> Otherwise, it is dicated by record-routing. Loose routers (i.e., those
>> that
>> implement RFC3261 as opposed to the obsoleted RFC2543) put peer's contact
>> in there, which is ideal. Strict routers put record-routing information
>> there. This alternative is valid in terms of an obsoleted spec.
>> 
>> -jiri
>> 
>> At 11:02 AM 10/14/2004, Richard wrote:
>> 
>> >Hi,
>> >
>> >I have a basic sip question. Whats the correct r-uri for ACK? I use
>> stateful forwarding, so all SIP messages pass through ser. I have seen two
>> types of UA. Some use the contact field of 200 OK response as the r-uri
>> and other use the original r-uri for INVITE.
>> >
>> >Is it a SIP violation to use the original r-uri of INVITE? The problem
>> here is that if there is a parallel forking for the INVITE, it might be
>> sent to places other than the real callee.
>> >
>> >Any comment?
>> >
>> >Thanks,
>> >
>> >Richard
>> >_______________________________________________
>> >Serusers mailing list
>> >serusers at lists.iptel.org
>> >http://lists.iptel.org/mailman/listinfo/serusers
>> 
>> --
>> Jiri Kuthan            http://iptel.org/~jiri/
>
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--
Jiri Kuthan            http://iptel.org/~jiri/