Cisco Unified Communications Manger and Cisco Router

[cg1]

Hi,
I have a cisco 2610XM router which has some phones connected to fxs ports, i also have Cisco Unified Communications (verson 6) with some ip phones connected.

They are both working ok but how can i create a trunk between them. the problem i'm having is that the router does not have call manager express installed.

Thanks.

 

[cg1]

I have now added the router as a gateway in call manager, and set a dial-peer on the router to connect to the call manager.

when i dial i just get the busy tone. i am using g711ulaw codec.

fixed: i had set it up right, the problem was with an unmanaged switch between my router and the switch the ip phone and call manager are connected to.