Aastra Telecom AASTRA 9112 I - Manual (Page 38)

New Features in 1.4.1
34 41-001024-00, Rev 09, Release 1.4.1
IP Phone Release Notes 1.4.1
Backup Proxy/Registrar Support
The IP phones now support a backup SIP proxy and backup SIP registrar feature.
If the primary server is unavailable, the phone automatically switches to the
backup server allowing the user's phone to remain in service.
How it Works
All SIP registration messages are sent to the primary registrar first. If the server is
unavailable, then a new registration request is sent to the backup registrar. This
also applies to registration renewal messages, which try the primary server before
the backup.
Similarly, any outgoing calls attempt to use the primary proxy first, then the
backup if necessary. In addition, subscriptions for BLF, BLA, and explicit MWI
can also use the backup proxy when the primary fails. Outgoing calls and the
previously mentioned subscriptions behave the same as registrations, where the
primary proxy is tried before the backup.
You can configure the backup SIP proxy on a global or per-line basis via the
configuration files or the Aastra Web UI.
Configuring via the Configuration Files
You can configure the following parameters for a backup SIP proxy and backup
SIP registrar.
Global parameters
Parameter –
sip backup proxy ip
Backup Proxy Server
(in Web UI)
Aastra Web UI Advanced Settings->Global SIP->
Basic SIP Network Settings
Configuration Files aastra.cfg, <mac>.cfg
Description The IP address of the backup SIP proxy server for which the IP phone
uses when the primary SIP proxy is unavailable.
Format IP address or fully qualified Domain Name
Default Value 0.0.0.0
Range Not Applicable
Example sip backup proxy ip: 192.168.0.102