The CallManager platform OS does not support the use of authenticated NTP. This function is required to better secure the network infrastructure. Without the use of NTP authentication, ACLs on the routers are necessary to ensure proper communication. NTP becomes more of an issue now that CallManagers are using certificates because the modification of the network time can invalidate certificates. For example:
1. Attacker changes year to 2006
2. Certificates are issued with a start year of 2006
3. Attacker changes year back to 2005
In other words, issuing certificates with a start year of "2006" and then means that those devices will not be able to function properly until 2006. NTP could be used as a form of denial of service. This is a request to provide NTP authentication support in the CallManagers to work with Cisco IOS NTP authentication, to be used in conjunction with ACLs.
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...