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Organization: SipXecs Forum
In-Reply-To: <dfdd94a3-5df2-4dff-8777-e99d3d154...@kerker.se>
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Message-ID: <ac85.4bb60...@forum.sipfoundry.org>



Hi,

I'm one of the people behind VOP, your comment "Voice
Operator Panel (VOP), and it's nice use of SIP REFER" raised
my recent google alert and I figured I could help :)

A REFER is used to ask a phone to initiate an
INVITE/Replaces to another phone.

The Refer-To field is used to tell the phone what is the
contact of the other phone where to send the
INVITE/Replaces.

In your case the Refer-To contains "mailto:2...@alsterph.lan";
as the remote contact.

My guess is that the router can not resolve this SIP URI
(its host) and then is unable to know where to send the
INVITE/Replaces.

In our software we have an option to use the remote URI
instead of the remote contact in the Refer-To field to
avoid/solve this problem. (but it breaks the REFER RFC3515)

You can check if your phone has this kind of option, or you
can modify your cisco DNS server to be able to resolve this
host(alsterph.lan) or you can change your internal phones
contacts to IPs instead of hosts.

Hope it helps !

PS: This answer is posted from forum.sipfoundry.org I hope
it gets trough the corresponding mailing-list.

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