After a few minutes of a call, we can no longer hear the receiver. They can hear us; we can’t hear them.
Our phone: Grandstream GXP2000 Enterprise IP phone
Their phone is through Asterisk using one of the channels in our T1. We are using the Digium T1 card (TE120P).
Processor AMD Opteron (load is low).
Our call plan works pretty good. We are now struggling with some issues like this on and we can’t seem to work them out.