[cisco-voip] Route Group Distribution Algorithm and SIP

[Dana Tong]

Don't know if this helps but I have that scenario working on a 2N Voiceblue Lite. If the GSM gw is unavailable or all 4 sim cards are in use, the call fails back to the local ISDN.

On the 2N under Gateway Configuration I have set the following:
SIP parameters | SIP Protocol
Check Send 180 Ringing instead of 183 Session progress
Check Send 200 OK instead of 180/183

There might be some other Service Parameters for Cisco CallManager | Advanced | SIP that you might need to check also.


I think I might have also had one route list, with two route groups. One route group being the SIP trunk to the GSM gateway and one route group being the H323 voice gateway to ISDN.

Hope this helps a little.

Cheers

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Nathan Reeves
Sent: Wednesday, 19 October 2011 6:32 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Route Group Distribution Algorithm and SIP

Scenario as follows:
 - 2 GSM Gateways located in different offices. (2N Voiceblue Enterprise)
 - 2 SIM Cards in each gateway.
 - GSM Gateways are connected via SIP trunks.

What I want to do is setup route patterns for specific (company plan) mobiles so that when calls are made to these numbers they head out the GSM gateways.  I'm having issues getting a failover scenario to work with this though.  If two calls are in progress on GSM Gateway 1, calls should be attempted on GSM Gateway 2.  If both channels are in use on Gateway 2 then we should push the calls out PSTN.

I've attempted to place the two Gateways in one Route group, but with two calls on Gateway 1, calls don't proceed to Gateway 2.  From logs I'm seeing on Gateway 1 that it's passing the following back to CUCM:

10/19/2011 20:06:08.38 <SIP> Rejecting incomming call. Reason 11

10/19/2011 20:06:08.39 <SIP> To: 10.10.10.1 SIP/2.0 480 Temporarily Unavailable


I've looked into using Locations and AAR but I'm not sure I'm going to get what I want with that setup.

Anybody have any ideas if something like this failover is possible? How does the the Distribution algorithm work in the situation of SIP Trunks and detection of failure / when we should proceed to the second gateway in the RG?

Thanks

Nathan
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