I have a 2800 gateway configured for the moment with one outgoing/incoming E1.

The configuration is a dial-peer pointing to a voice port. My voice-port is configured as follow :

voice-port 0/0/0:15

translate calling 10

cptone FR

bearer-cap Speech

I will add another E1 for the same dial-peer. As it's not possible to add two voice port for a dial-peer I tried to create a trunk-group under the voice-port but I have the following error :

C2821CCM(config-voiceport)#trunk-group 1

Error: Failed to add non-analog port to trunk group

Configure in cas-custom mode or serial interface

mode for T1/E1 digital ports and in BRI interface

mode for BRI voice ports

Creating the trunk-group under Interface serial prevent me to use the confiugration under the voice port (especialy cptone FR)

What is the best practice for trunk-group and how could i creat a trunk of voice-port ?

Thanks in advance