Cisco Cisco TelePresence Video Communication Server Expressway Maintenance Manual
Field
Description
Usage tips
Standard
registration
refresh
strategy
registration
refresh
strategy
The method used to generate the SIP registration expiry
period (the period within which a SIP endpoint must re-
register to prevent its registration expiring) for standard
registrations.
period (the period within which a SIP endpoint must re-
register to prevent its registration expiring) for standard
registrations.
Maximum: uses the lesser of the configured Maximum
refresh value and the value requested in the registration.
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.
configured Minimum refresh value and the lesser of the
configured Maximum refresh value and the value
requested in the registration.
The default is Maximum.
The Maximum setting uses the
requested value providing it is
within the specified maximum and
minimum ranges.
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.
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.
registered with the VCS. It does not
apply to endpoints whose
registrations are proxied through
the VCS.
Standard
registration
refresh
minimum
registration
refresh
minimum
The minimum allowed value for a SIP registration refresh
period for standard registrations. Requests for a value
lower than this will result in the registration being rejected
with a 423 Interval Too Brief response. The default is 45
seconds.
period for standard registrations. Requests for a value
lower than this will result in the registration being rejected
with a 423 Interval Too Brief response. The default is 45
seconds.
Standard
registration
refresh
maximum
registration
refresh
maximum
The maximum allowed value for a SIP registration refresh
period for standard registrations. Requests for a value
greater than this will result in a lower value being returned
(calculated according to the Standard registration
refresh strategy). The default is 60 seconds.
period for standard registrations. Requests for a value
greater than this will result in a lower value being returned
(calculated according to the Standard registration
refresh strategy). The default is 60 seconds.
Outbound
registration
refresh
strategy
registration
refresh
strategy
The method used to generate the SIP registration expiry
period for outbound registrations.
period for outbound registrations.
Maximum: uses the lesser of the configured Maximum
refresh value and the value requested in the registration.
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.
configured Minimum refresh value and the lesser of the
configured Maximum refresh value and the value
requested in the registration.
The default is Variable.
These options work in the same
manner as for the Standard
registration refresh strategy.
manner as for the Standard
registration refresh strategy.
However, outbound registrations
allow a much higher maximum
value than standard registrations.
This is because standard
registrations use the re-registration
mechanism to keep their
connection to the server alive. With
outbound registrations the keep-
alive process is handled by a
separate, less resource-intensive
process, meaning that re-
registrations (which are more
resource-intensive) can be less
frequent.
allow a much higher maximum
value than standard registrations.
This is because standard
registrations use the re-registration
mechanism to keep their
connection to the server alive. With
outbound registrations the keep-
alive process is handled by a
separate, less resource-intensive
process, meaning that re-
registrations (which are more
resource-intensive) can be less
frequent.
Outbound
registration
refresh
minimum
registration
refresh
minimum
The minimum allowed value for a SIP registration refresh
period for outbound registrations. Requests for a value
lower than this will result in the registration being rejected
with a 423 Interval Too Brief response. The default is 600
seconds.
period for outbound registrations. Requests for a value
lower than this will result in the registration being rejected
with a 423 Interval Too Brief response. The default is 600
seconds.
Cisco TelePresence Video Communication Server Administrator Guide (X8.5.2)
Page 122 of 567
Protocols
Configuring SIP