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

[Raj Jain]

You may want to try setting pedantic=yes in your sip.conf and retest this.
The following traces would be helpful:

sip set debug on
core set debug 10
core set verbose 10

You may want to open a bug in bug tracker and upload your config and log
files over there.

--
Raj


On Dec 23, 2007 7:47 AM, Tomasz Zieleniewski <tzieleniewski at gmail.com>
wrote:

> 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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