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

[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.

Thanks,
Raj


On Dec 22, 2007 9:51 AM, Tomasz Zieleniewski <tzieleniewski at gmail.com>
wrote:

> Hi,
>
> The message that asterisk receives is not a retransmission but this is the
> same message but it enters asterisk from other sip proxy  which is not a
> loop.
> The flow is the following
>
> Asterisk      SIP Proxy (Location Service)
> INVITE (to registrar)
> --------------------->
> INVITE (to voicemail when not registered)
> <--------------------
>
> when message enters asterisk for the second time it ofcorse has some extra
> SIP
> specific header like Record-Route and Via and the Request-URI is changed.
> And this causes 491 response.
> Can I do something about this?
> Can this behaviour be controlled, what do I have to change in the message
> so that asterisk won't treat it with 491 response?
>
> Thanks
> Tomasz
>
> On Dec 21, 2007 7:28 PM, Terry Wilson <twilson at digium.com> wrote:
>
> > What is the reason for such response?
> >
> >
> > SIP/2.0 491 Request Pending
> > Via: SIP/2.0/UDP  192.168.129.74:5160;branch=z9hG4bK17c3.17db29e7.0
> > ;received=192.168.129.74
> > Via: SIP/2.0/UDP  192.168.129.74 ;branch=z9hG4bK17c3.23083974.0
> > Via: SIP/2.0/UDP 192.168.129.74:5070;branch=z9hG4bK5b33ae78;rport=5070
> > From: "IPFon" <sip:0225761853 at 192.168.129.74:5070 >;tag=as7217acbc
> > To: <sip:tzl at voip.touk.pl>;tag=as7217acbc
> > Call-ID:  307fda656066a7e264e85cea0742e601 at 192.168.129.74
> > CSeq: 102 INVITE
> > User-Agent: Asterisk PBX
> > Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
> > Supported: replaces
> > Content-Length: 0
> > X-Asterisk-HangupCause: Normal Clearing
> > X-Asterisk-HangupCauseCode: 16
> >
> >
> > Asterisk will send a 491 Request Pending when it is currently processing
> > an INIVTE on a particular call and it gets another INVITE that isn't a
> > retransmission.
> >
> >
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