Re: call setup through parent GK in proxy mode

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Thats what ForwardOnFacility is for. By default its off, but when you
turn it on its supposed to handle this situation.

[RoutedMode]
ForwardOnFacility=1

Regards,
Jan


Simon Horne wrote:
> Tobias
> 
> I have seen this too. 
> The problem is that once an endpoint is registered you cannot call directly
> and the call must go through the gatekeeper.  When you call the endpoint you
> receive back a facility message with routeCalltoGatekeeper which instructs
> the caller to drop this call and call the gatekeeper.  In the facility
> message contains the gatekeeper address is the alternateAddress field. I
> think there also should be an alternateAlias field so the call to the
> gatekeeper knows where to forward on the call.  I think this might be a bug.
> We just need to find the time to debug the issue.
> 
> Simon
> 
> 
> 
> -----Original Message-----
> From: Tobias Marquart [mailto:tobimarq@xxxxxx] 
> Sent: Wednesday, January 26, 2011 8:30 AM
> To: Openh323gk-users@xxxxxxxxxxxxxxxxxxxxx
> Subject:  call setup through parent GK in proxy mode
> 
> Hi all,
> 
> we have a strange call setup behavior in a special situation. I hope that it
> has to do with the gnugk config so that we can somehow fix it.
> 
> We use gnugk in proxy mode (without any problems). Our gk is connected to a
> gatekeeper hierarchy (one neighbor/parent gk).
> 
> Consider 2 different types of external endpoints I try to call from a local
> endpoint:
> 
> 1) Endpoints that are not in any way connected to our Gatekeeper hierarchy,
> I call them by IP-Address
> 2) Endpoints that are connected to (=known in) our Gatekeeper hierarchy, but
> not registered directly with our GK.
> 
> The first type of endpoint works perfectly.
> The second type works perfectly when dialing via h323alias/E.164 However
> when trying to call these endpoints by using the IP-Address, the problem
> starts:
> First we realized an "unreachable destination" error at the local endpoint.
> This is in a somehow "closed" and NATted network environment.
> (when not behind NAT/firewall restrictions, the situation I describe below
> is the same, but the call setup nevertheless works).
> 
> We realized that the local endpoint tries to connect to the parent
> gatekeeper directly (at a very late point in time of the call setup).
> 
> Further analysis:
> The local endpoint gets a "h.225 CS facility" packet from our gnugk at an
> early point in the call setup.
> In this packet there is mentioned the IP-Address of the parent GK as
> "alternativeAddress".
> This facility packet does not appear in any of the other call setup
> scenarios (in the working scenarios there occurs an "Alerting" packet
> instead).
> The admissionRequest/admissionConfirm log entries on gnugk have absolutely
> identical flags and options regardless of the call setup scenario.
> 
> Gnugk just seems not not be able to do a "normal" call setup in that special
> case. The problem occurs with several remote endpoints, so it seems to be a
> general issue.
> I have detailed gnugk-logs and wireshark packet traces (from the local
> endpoint) available (via PM) in case this is necessary. However I hope that
> this behavior is somehow known (and can be fixed easily).
> 
> Btw: The situation happens also with the very newest gnugk release.
> 
> I very much hope you can help me somehow, tia, Tobias

-- 
Jan Willamowius, jan@xxxxxxxxxxxxxx, http://www.gnugk.org/

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