Specifications

factory default. Note the reversion affects IP PBX service only, but not other system services such as
DHCP, TFTP, and NTP. The backup IP PBX configuration files under TFTP remain intact after
reversion, so that one can restore to a specific time if a backup file had been generated then.
To revert the whole system back to the factory default as much as possible, hold the hardware Reset
button for 10 seconds. Since this will wipe out almost everything generated by the user, all system
interfaces and services must be configured from scratch again if no appropriate backup configuration
could be restored. Note that such reversion will not erase backup configurations and existing
voicemails. Backup configuration files could be deleted in the TFTP Service page and voicemails could
be deleted in the Maintenance page.
3.6.2 Advance
Select Service -> IP PBX Service, and then click the Advance tab to configure IP PBX parameters.
After the configuration, go to Service -> IP PBX Service, and click RESTART to activate changes.
Field Description
PBX SIP Port Specify the UDP port where the SIP service listens on.
RTP Port Range Limit the UDP ports used by the IP PBX for media
transport.
) The port range needs to have at least equals to the
(number of extensions (also count shared-lines) +
number of SIP trunks (also count terminal trunks)) * 2.
If selecting Enable Video Codec, the total amount
needs to multiply by 2 to have the least requirements
for RTP port range.
Max/Default Expiration Time Guard and advertise SIP registration respectively.
PBX Caller ID The default Caller ID for an unknown incoming call.
Enable Video Codec Select if there will be video clients registering to the
system.
Support Devices Multiplex Call-ID Select to force discrimination of SIP tags. Do this only
when there is such a client device in the system and other
devices supporting the same. Otherwise, one may find the
special device only got registered with this option but other
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