Cisco TelePresence Administrator's Manual page 118

Device authentication
example by another VCS on a previous hop), that system may insert information into the SIP message to
show that it has been authenticated. You can control whether the VCS chooses to trust any authentication
carried out at an earlier stage by configuring a zone's
Note that if the VCS is acting as a traversal server, you must ensure that each traversal client's
authentication credentials are entered into the selected database.
Endpoint credentials used for authentication
An endpoint must supply the VCS with a username and password if it is required to authenticate with the
VCS, for example when attempting to register and the relevant subzone's Authentication policy is set to
Check credentials.
For Cisco endpoints using H.323, the username is typically the endpoint's Authentication ID; for Cisco
endpoints using SIP it is typically the endpoint's Authentication username.
See the relevant endpoint manual for details about how to configure the endpoint's credentials.
Cisco VCS Administrator Guide (X8.1.1)
SIP authentication trust setting.
About device authentication
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