Cisco TelePresence Administrator's Manual page 425

Reference material
SIP Authentication Digest Nonce Limit: <1..65535>
Maximum limit on the number of nonces to store.
Default: 10000
Example: xConfiguration SIP Authentication Digest Nonce Limit: 10000
SIP Authentication Digest Nonce Maximum Use Count: <1..1024>
Maximum number of times that a nonce generated by the VCS may be used by a client.
Default: 128
Example: xConfiguration SIP Authentication Digest Nonce Maximum Use Count: 128
SIP Authentication NTLM Mode: <On/Off/Auto>
Controls when the VCS will challenge endpoints using the NTLM protocol.
Off: the VCS will never send a challenge containing the NTLM protocol.
On: the VCS will always include NTLM in its challenges.
Auto: the VCS will decide based on endpoint type whether to challenge with NTLM.
Default: Auto
Example: xConfiguration SIP Authentication NTLM Mode: Auto
SIP Authentication NTLM SA Lifetime: <30..43200>
Specifies the lifetime of NTLM security associations in seconds.
Default: 28800
Example: xConfiguration SIP Authentication NTLM SA Lifetime: 28800
SIP Authentication NTLM SA Limit: <1..65535>
Maximum number of NTLM security associations to store.
Default: 10000
Example: xConfiguration SIP Authentication NTLM SA Limit: 10000
SIP Authentication Retry Limit: <1..16>
The number of times a SIP UA will be challenged due to authentication failure before receiving a 403 Forbidden
response. Note that this applies only to SIP Digest challenges (not NTLM challenges).
Default: 3
Example: xConfiguration SIP Authentication Retry Limit: 3
SIP Domains Domain [1..200] Name: <S: 0,128>
Specifies a domain for which this VCS is authoritative. The VCS will act as a SIP registrar and Presence Server
for this domain, and will accept registration requests for any SIP endpoints attempting to register with an alias
that includes this domain. The domain name can comprise multiple levels. Each level's name can only contain
letters, digits and hyphens, with each level separated by a period (dot). A level name cannot start or end with a
hyphen, and the final level name must start with a letter. An example valid domain name is "100.example-
name.com".
Example: xConfiguration SIP Domains Domain 1 Name: "100.example-name.com"
SIP GRUU Mode: <On/Off>
Controls whether GRUU (RFC5627) support is active.
Default: On
Example: xConfiguration SIP GRUU Mode: On
Cisco VCS Administrator Guide (X7.2) Page 425 of 498