ADTRAN AOS Version R10.1.0 Command Reference Manual page 1127

Command Reference Guide
ip sip prefer double-reinvite
Use the ip sip prefer double-reinvite command to specify globally that Session Initiation Protocol (SIP)
double reInvite messages are included in calls in the system. Calls that typically require a double reInvite
are forwarded calls from call overage and any attended transfer, and when these calls connect, a double
reInvite message is initiated when the feature is enabled. Using the no form of this command indicates that
double reInvites are not globally preferred. Use the commands
prefer reinvite-without-sdp on page 3583
This command should only be issued by advanced users or at the direction of ADTRAN
technical support.
Syntax Description
No subcommands.
Default Values
By default, all calls in the system prefer a double reInvite.
Command History
Release A5.01
Functional Notes
The ip sip prefer double-reinvite command is used in the Global Configuration mode to determine
whether a double reInvite is preferred in calls in the system. By default, the system is configured so that
double reInvites are preferred, and all trunk accounts prefer a double reInvite. Double reInvites are used,
for example, when a SIP trunk in local transfer mode is providing ring-back during a blind transfer. In this
scenario, a double reInvite must occur in order to establish a talk path after the transfer target answers.
You can specify whether a specific trunk prefers a double reInvite by using the command
double-reinvite on page
You can also specify whether Session Description Protocol (SDP) is used in the double reInvite message.
To send a double reInvite without SDP, refer to the command
When a double reInvite is initiated, the first reInvite without SDP is not sent to the account that does not
require it. When both accounts do not require a reInvite with SDP, the target account sends the initial
reInvite message.
Usage Examples
The following example specifies that SIP double reInvites are not preferred in the system:
(config)#no ip sip prefer double-reinvite
60000CRG0-35E
to specify the trunk settings for this feature.
Command was introduced.
3582.
Copyright © 2012 ADTRAN, Inc.
Global Configuration Mode Command Set
prefer double-reinvite on page 3582
prefer reinvite-without-sdp on page
and
prefer
3583.
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