I created a extension in Asterisk, the extension has been configured in
Android softphone 3cx. When I tried to call from Andorid phone to some other
IP extension which is registered in Asterisk, I am not able to hear the
voice, when I check the asterisk log or wireshark there is only one way RTP
traffic, from Android I am connecting to Asterisk via 2G GSM network.
Any idea would be appreciated.