If the external caller cannot hear the internal IP phone you're looking at a one way audio problem where the internal IP phone's audio isn't getting out to the PSTN caller. If you're able to reproduce this problem before the internal user hangs up you can bring up the phone's web page by putting the phone's IP address into a browser (make sure the CCMAdmin phone setting, web access is enabled too) and going to Stream 1. This page will show you where the IP phone is sending it's audio to in the remote address field. I would then refresh the page a few times to look at the RX and TX counters to make sure that the transmit counters are increasing each time you refresh the page.
Now that you know where the IP phone is transmitting audio to, the next step is to connect to the gateway that audio is going to and running some show commands to check the RTP counters for the call such as "show call active voice brief" multiple times to look for counters incrementing on the gateway.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...