Yealink T5 Series Administrator's Guide

Administrator’s Guide for SIP-T58V/T58A/T56A/CP960 IP Phones
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Parameter account.X.instance_id.enable <MAC>.cfg
Description
It enables or disables the phone to add +sip.instance attribute to the Contact header of the REGISTER mes-
sage.
Permitted
Values
0-Disabled
1-Enabled
Default 0
[1]
X is the account ID. For T58V/T58A/T56A, X=1-16; for CP960, X=1.
[2]
If you change this parameter, the phone will reboot to make the change take effect.
Outbound Proxy in Dialog
An outbound proxy server can receive all initiating request messages and route them to the designated destination. If
the IP phone is configured to use an outbound proxy server within a dialog, all SIP request messages from the phone
will be sent to the outbound proxy server as a mandatory requirement.
Note
To use this feature, make sure the outbound server has been correctly configured on the IP phone. For more information on
how to configure the outbound server, refer to Server Redundancy.
Topic
Outbound Proxy in Dialog Configuration
Outbound Proxy in Dialog Configuration
The following table lists the parameter you can use to configure outbound proxy in dialog.
Parameter sip.use_out_bound_in_dialog <y0000000000xx>.cfg
Description
It enables or disables the phone to send all SIP requests to the outbound proxy server mandatorily in a dia-
log.
Note: It works only if “account.X.outbound_proxy_enable” is set to 1 (Enabled).
Permitted
Values
0-Disabled, only the new SIP request messages from the phone will be sent to the outbound proxy server
in a dialog.
1-Enabled, all the SIP request messages from the phone will be sent to the outbound proxy server in a dia-
log.
Default 0
Web UI Features->General Information->Use Outbound Proxy In Dialog
Server Redundancy
Server redundancy is often required in VoIP deployments to ensure continuity of phone service, for example, take the
call server offline for maintenance, the server fails, or the connection between the IP phone and the server fails.
Two types of redundancy are possible. In some cases, a combination of the two may be deployed:
l Failover: In this mode, the full phone system functionality is preserved by having a second equivalent capability call
server take over from the one that has gone down/off-line. This mode of operation should be done using the DNS

Yealink T5 Series Specifications

General

Brand	Yealink
Model	T5 Series
Category	IP Phone
Language	English