I have one asterisk server on which i am running pbx, another asterisk server on which i have installed TDM2400P and deployed 4 lines.
I have made SP trunking between pbx server and TDM2400P server, so that call made from pbx will go out from my PSTN line and incoming also lands on pbx server.
There is problem when we make call on any pstn number we hear our own voice back, however it does not happen when we call on mobile number. We have also configure Dlink Hard phone DPH400SE. Our voice only echo when we call land line number. Please let me know if I need to do some changes.
Thanks in advance.