A patient calls our clinic and the receptionist will put them on hold. When attempting to return to the call the receptionist hears silence, but the call is still active according to her 7960 phone. She eventually hangs up. A few minutes later the patient calls back and reports that they could hear the receptionist, but the receptionist couldn't hear them.
I have reset the phones, gateways, and CallManager. We are running CCM 4.0(2a)es88. The 7960 phone firmware is P00308000300. The router is a 1760 running image file C1700-SV8Y7-MZ.123-2.XC.BIN
I have the same issue when the call suddenly would go one-way. Pressing Hold and then Resume fixes it. This is happening with both P00308000400 and P00308000500. Apparently these loads still have bugs in them. Looking at packet captures the bug might be triggered by ICMP packets sent to IP phone. Cisco TAC is reviewing packet captures.
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