I'm trying integration with SBC PSTN with SIP trunk (inband-g711aluw). All calls is always success ring and getting connection or answered, but the problem are when sending dtmf always send double digit and the destination does not receive tone. any idea about this ?
I have trying :
CME - CUBE (SIP trunk - inband G711aluw) - SBC -> DTMF Fail
CUCM - CUBE (SIP trunk - inband G711aluw) - SBC -> DTMF Fail