FXO -> GSM Gateway Problem

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Hi Alec and Duncan

Thank you both for taking the time to reply.

Firstly regarding Duncan’s post.
The asterisk makes a call fine when the FXO card is connected to a analogue
landline and the GSM Gateway works fine when connected to standard phone
handset. The problem only arises when I connect to GSM Gateway to the FXO
card. Within all 3 scenarios I’m using the same RJ11 to RJ11 cable.

Secondly regarding Alec’s post.
I made the changes you suggested in the chan_dahdi.conf, rebooted and
tested. Unfortunately it didn’t solve the issue.
Shown below is the new chan_dahdi.conf file and the Asterisk CLI for the
call using them setting.

channel => 1

Asterisk CLI
== Using SIP RTP CoS mark 5