Outbound Proxy In Dialog; Outbound Proxy In Dialog Configuration; Server Redundancy - Yealink SIP-T2 Series Administrator's Manual

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 IP 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
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
It enables or disables the IP phone to send all SIP requests to the outbound proxy server mandatorily in a
dialog.
Description
Note: It works only if "account.X.outbound_proxy_enable" is set to 1 (Enabled).
0-Disabled, only the new SIP request messages from the IP phone will be sent to the outbound proxy
server in a dialog.
Permitted
Values
1-Enabled, all the SIP request messages from the IP phone will be sent to the outbound proxy server in a
dialog.
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:
Failover: In this mode, the full phone system functionality is preserved by having a second equivalent capability call
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server take over from the one that has gone down/off-line. This mode of operation should be done using the DNS
mechanism from the primary to the secondary server. Therefore, if you want to use this mode, the server must be
configured with a domain name.
Fallback: In this mode, a second less featured call server with SIP capability takes over call control to provide basic
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calling capability, but without some advanced features (for example, shared line and MWI) offered by the working
server. IP phones support configuration of two servers per SIP registration for the fallback purpose.
Note
For concurrent registration mode, it has a certain limitation when using some advanced features, and for successive regis-
tration mode, the phone service may have a brief interrupt while the server fails. So we recommend you to use the failover
mode for server redundancy because this mode can ensure the continuity of the phone service and you can use all the call
features while the server fails.
Phone Configuration for Redundancy Implementation
Server Redundancy .
<y0000000000xx>.cfg
Account Settings
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