User Guide

GRP26XX Administration Guide
P a g e | 33
Proxy-Require
A SIP Extension to notify the SIP server that the phone is behind a
NAT/Firewall. Do not configure this parameter unless this feature is
supported on the SIP server.
Use SBC
Indicate whether or not a SBC server is used, if users want to work under
SBC associated with 3CX, they should enable this feature to have better
communication with the server.
Account x → SIP Settings → Basic Settings
TEL URI
If the phone has an assigned PSTN telephone number, this field should be
set to “User=Phone”.
Then a “User=Phone” parameter will be attached to the Request-Line and
“TO” header in the SIP request to indicate the E.164 number.
If set to “Enable”, “Tel:” will be used instead of “SIP:” in the SIP request. The
default setting is “Disable”.
SIP Registration
Selects whether the phone will send SIP Register messages to the
proxy/server. The default setting is “Yes”.
Unregister On Reboot
Allows the SIP user’s registration information to be cleared when the phone
reboots. The SIP REGISTER message will contain “Expires: 0” to unbind the
connection. Three options are available: The default setting is “No”.
• If set to “All”, the SIP user’s registration information will be cleared when
the phone reboots. The SIP Contact header will contain “*” to notify the
server to unbind the connection.
• If set to “Instance”, the SIP user will be unregistered on current phone
only.
• If set to “No”, the phone will not unregister the SIP account when
rebooting.
Register Expiration
Specifies the frequency (in minutes) in which the phone refreshes its
registration with the specified registrar. The default value is 60 minutes.
The maximum value is 64800 minutes (about 45 days).
Subscribe Expiration
Specifies the frequency (in minutes) in which the phone refreshes its
subscription with the specified registrar. The maximum value is 64800 (about
45 days). The default value is 60 minutes.
Reregister Before
Expiration
Specifies the time frequency (in seconds) that the phone sends re-
registration request before the Register Expiration. The default value is 0.
Enable OPTIONS Keep
Alive
Enable OPTIONS Keep Alive to check SIP Server.
OPTIONS Keep Alive
Interval
Time interval for OPTIONS Keep Alive feature in Second.