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SIP Trunk Tandeming


Don
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In our operating environment we have multiple PBX instances at resorts that are nearby each other. Each building has it's own IP service via fiber optic entrance. We have a high speed microwave IP route between the buildings for backup. This allows us to route to the alternative path on a fiber failure. This works fine for video and Internet restoral.

 

We would like to be able to be able to send calls from the PBX in one building to the other so that on a failure of that building fiber systems calls could still be completed via the link to the redundant IP entrance.

 

Is there any way to tandem SIP calls? In other words can a call coming into a SIP trunk be routed to another SIP trunk in a tandem arrangement? This would allow us to have DID traffic sent to the backup SIP trunk and then completed on the appropriate PBX.

 

Kevin Moroz suggested that in 3.0 using the tandeming capability that was added for MS Exchange Server calls may be a potential answer.

 

Any help is appreciated.

 

Don Heckman

IPacket Networks

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In our operating environment we have multiple PBX instances at resorts that are nearby each other. Each building has it's own IP service via fiber optic entrance. We have a high speed microwave IP route between the buildings for backup. This allows us to route to the alternative path on a fiber failure. This works fine for video and Internet restoral.

 

Nice :(

 

We would like to be able to be able to send calls from the PBX in one building to the other so that on a failure of that building fiber systems calls could still be completed via the link to the redundant IP entrance.

 

Is there any way to tandem SIP calls? In other words can a call coming into a SIP trunk be routed to another SIP trunk in a tandem arrangement? This would allow us to have DID traffic sent to the backup SIP trunk and then completed on the appropriate PBX.

 

Kevin Moroz suggested that in 3.0 using the tandeming capability that was added for MS Exchange Server calls may be a potential answer.

 

First, IP is a pretty redundant protocol already. If you have redundant ways of sending the traffic, it should be possible to let the routers do the failover. Then the application layer (in this case, the SIP-PBX) will just have a little hickup during the switchover.

 

Are your registering those PBX trunks? If that is the case, we could do stuff like double registrations or even use a "hunt group" (!) on the central switch that first tries the first building trunk, and if there is nothing coming back it tries the trunk to the second building.

 

Not sure if the trunk redirection would help in this case - if that PBX goes offline, it will not be able to redirect the calls!

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