Yealink SIP-T54S Administrator's Manual page 458

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
Procedure
Use outbound proxy in dialog can be configured using the following methods.
Central Provisioning
(Configuration File)
Web User Interface
Details of the Configuration Parameter:
sip.use_out_bound_in_dialog
Description:
Enables or disables the IP phone to send all SIP requests to the outbound proxy server
forcibly in a dialog.
0-Disabled
1-Enabled
If it is set to 0 (Disabled), only the new SIP request messages from the IP phone will be sent
to the outbound proxy server in a dialog.
If it is set to 1 (Enabled), all the SIP request messages from the IP phone will be forced to
send to the outbound proxy server in a dialog.
Note: It works only if the value of the parameter "account.X.outbound_proxy_enable" is set
to 1 (Enabled) and the outbound server address has been correctly configured on the
phone.
Web User Interface:
Features->General Information->Use Outbound Proxy In Dialog
Phone User Interface:
None
To configure use outbound proxy in dialog via web user interface:
1. Click on Features->General Information.
432
<y0000000000xx>.cfg
Parameter
Specify whether to use outbound
proxy in a dialog.
Parameter:
sip.use_out_bound_in_dialog
Specify whether to use outbound
proxy in a dialog.
Navigate to:
http://<phoneIPAddress>/servlet?
p=features-general&q=load
Permitted Values
0 or 1
Default
1