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Command Reference Guide
Voice SIP Trunk Command Set
sip-server validation register
Use the sip-server validation register command to enable Session Initiation Protocol (SIP) server
validation on the trunk for use in SIP trunk failover. When this feature is enabled, new REGISTER
requests are only sent to valid servers, or the highest priority server to which the SIP trunk can register.
Use the no form of this command to disable the validation feature.
Syntax Description
No subcommands.
Default Values
By default, SIP server validation is disabled.
Command History
Release A5.01
Command was introduced.
Functional Notes
Enabling this feature configures the trunk to use the validated form of SIP trunk failover. This method of
SIP trunk failover works in this manner:
When the AOS unit first boots, it establishes a prioritized list of SIP server addresses, using DNS as
necessary. It uses the highest priority server as the destination of outbound trunk registrations. As long as
these registrations are successful, the unit continues to use that server. If a failover condition occurs (if a
request times out or there is no response from the server), the unit unregisters the specific registration to
that server. The unit then iterates through the prioritized list of servers to find a valid one. A server is valid
if it accepts the trunk registration request. All other trunk registrations remain unchanged. When the
registration expires, the new REGISTER request is always sent to the highest priority server address in the
list.
Usage Examples
The following example enables SIP server validation for the trunk:
(config)#voice trunk t01 type sip
(config-t01)#sip-server validation register
60000CRG0-35E
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