I have an AS5400XM in which different providers terminate traffic to it form remote locations and I send this traffic over ISDN E1s to my PSTN switch.

Now my problem is that I need to map each dial peer on the VOIP coming from the remote site to a specific ISDN E1 (POTS) or group of E1s that go from the AS5400XM to the PSTN.

In other words I want to separate the different terminating sites to have their own E1/s going into the PSTN so I can Bill the remote sites from the PSTN based on the trunk group/s going to the PSTN from the AS5400XM

Can anybody out their help me with the configuration on the AS5400XM