I have 2 asterisk boxes connected both through internet with 8Mbit via IAX trunking. In asterisk A I have one TE410P card with one E1 active and I receive calls from PSTN and send them to asterisk B.
In asterisk B I have other TE410P and one port is connected to one TOPEX GSM Gateway for outgoing calls to GSM network.
Anyone using TOPEX with Asterisk connected with E1 interface? I have problems about quality of calls and ASR indicator is really low. I tested to use other IP gateways and it was fine.