I have a UC520 system that is using a SIP trunk. There is an ISDN for local break out. Everything works fine except for calls that come in via the SIP trunk which then get forwarded back out of the SIP trunk. The call setup works but when the forwarded call is answered there is no voice.
I have the command allow-connections sip to sip on the router.
I have seen posts with people having issues with the SIP provider so I have asked them to debug calls from their end. I have had to configure the use of the g711alaw codec for calls as that is what the provider has asked for so they can debug from their end.
I have attached the response from the SIP trunk provider and debugs for all the ccsip options with and without the supplementary service sip refer command.
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...