VoIP protocols use dynamic port numbers that are negotiated while establishing a call. The port numbers and addresses are exchanged during the negotiation phase in the IP packet payload. This presents a challenge when configured along with NAT because NAT normally looks only at the IP header to do the translation.
Cisco IOS? Software has been enhanced with the Application Layer Gateway (ALG) feature, which is intelligent enough to automatically scan the addresses and port numbers carried in the payload of these protocols. This feature allows VoIP to work across a NAT router by setting up translations for the negotiated parameters.
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...