Configure voice rtp send-recv on the gateway-Sometimes you have one-way audio problems only when calling specific numbers, such as 411 or 911 in the North American numbering plan (NANP) or after you transfer a call or put it on hold. If you are having these problems when going through a Cisco IOS software voice gateway, be sure that the voice rtp send-recv command is configured on the gateway. Numbers such as 411 and 911 sometimes do not send back answer supervision when the remote end answers. As a result, the Cisco IOS software voice gateway does not cut through audio in both directions to prevent toll fraud. Configuring the voice rtp send-recv command forces the voice gateway to cut through audio in both directions immediately.
I have had the same issue and used the above command as a temp fix, but it is my understanding that this type of call will fail after 3 minutes (at least according to TAC). Good enough for most calls, but not really a permanent fix.
Has anyone come across a permanent fix? Right now we are not receiving the Connect message from Telco and are having a devil of a time getting anywhere with them.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...