Cisco TelePresence Administrator's Manual page 85

Field Description
Allow CRL Controls whether the download of CRLs from the CDP
downloads URIs contained in X.509 certificates is allowed.
from CDPs
Fallback Controls the revocation checking behavior if the
behavior revocation status cannot be established, for example if
the revocation source cannot be contacted.
Treat as revoked: treat the certificate as revoked (and
thus do not allow the TLS connection).
Treat as not revoked: treat the certificate as not
revoked.
Default: Treat as not revoked
Registration controls section:
Standard The method used to generate the SIP registration
registration expiry period for standard registrations.
refresh
Maximum: uses the lesser of the configured Maximum
strategy
refresh value and the value requested in the
registration.
Variable: generates a random value between the
configured Minimum refresh value and the lesser of
the configured Maximum refresh value and the value
requested in the registration.
The default is Maximum.
Standard The minimum allowed value for a SIP registration
registration refresh period for standard registrations. Requests for a
refresh value lower than this will result in the registration being
minimum rejected with a 423 Interval Too Brief response. The
default is 45 seconds.
Standard The maximum allowed value for a SIP registration
registration refresh period for standard registrations. Requests for a
refresh value greater than this will result in a lower value being
maximum returned (calculated according to the Standard
registration refresh strategy). The default is 60
seconds.
Cisco VCS Administrator Guide (X7.2)
Usage tips
The registration expiry period is the
period within which a SIP endpoint
must re-register to prevent its
registration expiring.
The Maximum setting uses the
requested value providing it is within
the specified maximum and minimum
ranges.
The Variable setting calculates a
random refresh period for each
registration (and re-registration)
request in an attempt to continually
spread the load. The VCS never
returns a value higher than what was
requested.
This applies only to endpoints
registered with the VCS. It does not
apply to endpoints whose
registrations are proxied through the
VCS.
See Registration refresh intervals
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Protocols