[asterisk-users] Asterisk SIP handling - why 491 Request Pending response

[Tomasz Zieleniewski]

it seems that asterisk in not cheking tags in to and from headers.
When asterisk responds to the second INVITE it puts again the same tag in
the To header: tag=as62247c57

what kind of trace can I catch to have more details here?

On Dec 23, 2007 12:51 PM, Raj Jain <rj2807 at gmail.com> wrote:

> Olle,
>
> You're right. I missed one thing when I concluded that this was an INVITE
> glare condition, which is that when the UAC and UAS dialogs are matched
> they're compared with respect to their LOCAL and REMOTE tags as opposed to
> the To and From tags. The LOCAL and REMOTE tags will get filled either with
> To or From tag depending on whether you're looking at the dialog from the
> UAC or from the UAS. So, in this case you'll have two dialogs in Asterisk
> and they'll have the same Call-Id but their tags will be swapped.
>
> Do you think Asterisk dialog matching is coded to handle this? While we've
> not seen a trace yet, it'd seem like we're missing something because we're
> sending back a 491.
>
> Raj
>
>
>
> On Dec 23, 2007 2:21 AM, Johansson Olle E <oej at edvina.net> wrote:
>
> >
> > 23 dec 2007 kl. 01.45 skrev Raj Jain:
> >
> > > You can not do this. You can not have an INVITE that Asterisk
> > > originated enter back into Asterisk. Technically this is not a loop,
> > > but this is an INVITE glare and the way Asterisk is reacting is
> > > correct.
> > >
> > > You'll need to change the Call-Id of the INVITE that goes into
> > > Asterisk (a proxy can not do that so you'll need a B2BUA), or else
> > > you can do something like what Olle suggested.
> >
> > I don't really agree here Raj. Of course you can send an INVITE to an
> > URI hosted by the proxy and the location table points back to one or
> > several URI's in the same Asterisk server.
> >
> > /O
> >
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