User`s guide

System Administrator’s Guide – Release 7.2.3.x
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Revised: September 1, 2010
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RTP Media Range (Port to Port) – This parameter specifies the range of UDP ports used for Real Time
Packet communications. Using a maximum range of values makes the port expander the most secured from
snooping and denial of service activities. However, when remote port expanders are placed behind 3
rd
-party
firewalls, under certain conditions the UDP port range may need to be restricted so that mapping rules can be
created for each port expander behind the firewall. See Section 14, Remote Allworx Phones, for more
information.
SIP NAT Keep-alive Interval
– Some NAT firewalls will automatically time out and close connections to
devices they protect. If a remote port expander is behind such a firewall, then this setting prevents the
timeout. Messages called keep-alive packets are sent from the port expander to the Allworx
server at the
frequency specified. The value should be set to an interval that is shorter than the firewall timeout.
SIP Port
– This is the UDP port number used for the SIP protocol by the port expander. The default value of
5060 should be used unless the port expander is behind a 3
rd
-party firewall and the network requires a
different value.
Time Zone
– Specifies the time zone that the handset uses to compute its local time. Select Use Current
Server Setting if the port expander is in the same time zone as the server. For a remote port expander, you
may want to use the time zone of its actual location.
Daylight Savings Time -
Specifies if the port expander will use Daylight Savings Time (DST) to compute its
local time. Select Use Current Server Setting if the port expander is in the same time zone as the server. For
a remote port expander, you may want to use the DST setting of its actual location.
Jitter Buffer Size
– Jitter is a variation in network audio packet latency experienced by the port expander,
resulting in a reduction in audio quality. The port expander uses a jitter buffer to maximize the audio quality
when jitter occurs. This configuration parameter can be used to alter the size of the jitter buffer.
10.2.2 Configuring FXO and FXS Ports
Once a port expander is installed, its FXS and FXO ports can be configured on the Handsets and Outside
Lines pages, just like the server’s own ports. On the Dial Plan page, port expander FXO ports are
automatically added to the default service groups. New custom service groups can be created or existing
ones modified to include the port expander’s FXO ports.
10.3 Fax Server Support
Allworx Systems provide the ability to send control information in the form of DTMF digits to devices
connected to the servers FXS ports. An extension phone number and/or the dialed number (DNIS) along with
arbitrary DTMF characters can be used to control the following devices:
• Analog FAX servers (e.g. Multi-Tech FaxFinder)
• External paging amplifiers
• External voicemail servers
The digits will be sent immediately after the device answers and before any audio from the calling source is
available.
To add the device and configure which DTMF digits will be sent, navigate to Phone System / Handsets page.
1. Select the New Analog Handset
link for the desired port
2. Add a description of the device