[OpenSER-Users] Not adding record-route for ack

[Robert Dyck]

I need to add a warning regarding Record_Route as it relates to ACK. The 
opensource PBX asterisk has a bug where it does _not_ ignore RR in the ACK. 
It seems that most UAs send an RR list with the ACK and if it is the same as 
the original list, it causes no harm. Some UAs like Twinkle do not send RR 
with the ACK and asterisk will create a null route set. Subsequent messages 
will be misrouted.

There is a recent patch for asterisk but who knows how many have been updated.
See bugs.digium.com, bug #11545.

On Sunday 09 March 2008, Vikas CG. wrote:
> Thanks Robert Dyck,
>    For the suggestion.
> Thanks,
> Vikas C.G.
>
> -----Original Message-----
> From: Robert Dyck [mailto:rob.dyck at telus.net]
> Sent: Sunday, March 09, 2008 4:56 AM
> To: users at lists.openser.org
> Cc: Vikas CG.
> Subject: Re: [OpenSER-Users] Not adding record-route for ack
>
> The route is determined by the INVITE as it makes it's way from the UAC
> to UAS
> while collecting Record-Route's as it goes. The UAS then forwards the
> Record-Route list back to the UAC in the 200 OK. Both ends are now aware
> of
> the route set which will not be altered in this dialogue. Any further
> messages in this dialogue must follow the route set. If in-dialogue
> messages
> contain Record_Route the Record-Route must be ignored.
>
> The short answer is that ACK may contain Record_Route but it will be
> ignored.
>
> On Saturday 08 March 2008, Vikas CG. wrote:
> > Hi all,
> >
> >     We have built an SIPALG and using openser server as outbound proxy
> > for testing,
> >     When call is made,
> >
> >     Ack message contains the route for openser,
> >     After receiving the message he is forwarding to next route, but
>
> not
>
> > making it has record-route.
> >     Is this behavior is right?
> >     Other servers will add record-route after forwarding to next
>
> route.
>
> >    So please suggest for this?
> >
> > Thanks,
> > Vikas C.G.