Configure Telephony using 2811 router and Central Office server

[Stork66722]

Hi Cisco Community!

I am having some trouble enabling telephony-service within packet tracer.

Here is what I have:

2811 Router

to

CO Server

to

Cell Towers

to

Multiple Smart Phones

I have been able to connect everything and can ping between the router and smart phones. But I can't seem to get my smart phones assigned to telephony-service to add numbers and make voice calls on the IP communicator. 

Hoping for any tips...

[NetworkDave]

@Stork66722,

Please provide the zipped pkt file for review.

[Stork66722]

Any tips would be greatly appreciated....