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Controlling which CUCM server communicate over a SIP trunk

Answered Question
Jul 8th, 2014
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We have 3 CUCM servers, two sub and one pub at two different physical locations.

 

There are two SIP trunk servers (non Cisco), we wish to have the CUCM at the same physical location to communicate with the SIP trunk device at its location, instead of going over the WAN to communicate with the other one.

 

Communications are initiated from the CUCM side through a route pattern that points to a RL/RG that contains the SIP trunk.

The SIP trunk uses a DP that uses a CUCM group that only contains the local CUCM server.

 

Can this be setup to reliably control which CUCM server talks to the SIP trunk server at its location?

Do we need to configure something differently?

 

 

 

 

 

Correct Answer by Ayodeji Okanlawon about 3 years 1 month ago

There other factors that determing the originating node from which a call will proceed. ie the cucm server that willbe used. These fatcors include:

the node the phone making the call is registered to, run on all active node is selected or not and the the cucm group on the RL. Please refer to the link below to know how cucm chooses which server it uses for a call over a sip trunk..

https://supportforums.cisco.com/blog/12088366/sip-trunks-and-run-all-act...

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mainsourceC Tue, 07/08/2014 - 16:02
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I forgot to include, we want to control it by what route pattern is used.

One route pattern hits SIP server A from CUCM A while another route pattern hits SIP server B from CUCM B.

 

(The As' being at one location while the Bs' are at the second location.)

 

Venkatesh Perumal Tue, 07/08/2014 - 17:12
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Hi,

If the CUCM's are located in different physical location then the communication should be over the IP-WAN and if it is about different CUCM Cluster then we can use H323 ICT Trunk between CUCM server for communication which is again WANLink.

Still not clear with your query, However as you want to control the Gwy/Trunks using the Route Pattern. You can create two separate route pattern for internal & external.
Wherein in Internal Route Pattern you can specify the ICT/SipTrunk/GWY which is connected within the cluster under Route List/RouteGroup to route the call.
And for External Route Pattern specify the Gwy/SipTrunk which connects you to the outside world.

 

Regards,

Venkatesh

Correct Answer
Ayodeji Okanlawon Wed, 07/09/2014 - 02:09
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There other factors that determing the originating node from which a call will proceed. ie the cucm server that willbe used. These fatcors include:

the node the phone making the call is registered to, run on all active node is selected or not and the the cucm group on the RL. Please refer to the link below to know how cucm chooses which server it uses for a call over a sip trunk..

https://supportforums.cisco.com/blog/12088366/sip-trunks-and-run-all-act...

mainsourceC Wed, 07/09/2014 - 05:56
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Very nice link, thanks!

Is there a way to influence which CUCM node the RL registers with?

 

 

Ayodeji Okanlawon Wed, 07/09/2014 - 05:58
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Yes, its the first server in the cucm group.

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