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Command Reference Guide
ip sip timer rollover <value>
Use the ip sip timer rollover command to specify the time period (in seconds) that the Session Initiation
Protocol (SIP) proxy is set to wait for a response to a request before attempting to find an alternate
destination. Use the no form of this command to return to the default value.
Syntax Description
<value>
Default Values
By default, the rollover timer is set to 3 seconds.
Command History
Release 11.1
Functional Notes
The ip sip timer rollover command sets the SIP timer B value for Invite transactions originating from a
SIP trunk. When originating a call, the SIP trunk attempts to send Invite messages to the primary SIP
server and waits for a response. If there is no response, the SIP trunk waits for 0.5 seconds before
attempting to send another Invite to the same SIP server. If no response, the SIP trunk waits for 1 second
before attempting to send another Invite, then waits 2 seconds, and so on. These increasing intervals are
shown in the diagram below.
Times are shown in seconds.
The rollover timer allows the user to control how long to wait before trying the next server. In the diagram
above, the red line indicates the rollover timer expiration. If there is no response after the timer expires, the
SIP trunk will attempt to send Invite messages to the highest priority backup SIP server obtained via DNS
service (SRV). The SIP trunk starts over at T=0 with the next server and doesn't send any more messages
to the timed out server. As long as the SIP trunk does not receive a response, it will continue this cycle until
it has attempted to contact all the SIP servers.
60000CRG0-35E
Specifies the time period in seconds. Range is 1 to 32 seconds.
Command was introduced.
Copyright © 2012 ADTRAN, Inc.
Global Configuration Mode Command Set
1161
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