User`s guide

Allworx Server Administrator’s Guide Version 7.6
1-866-ALLWORX * 585-421-3850 Page 121
www.allworx.com
Revised: 11/22/13
13.4.11Configure FXO and FXS Ports
After installing an Allworx Port Expander, the Allworx Server Administrator can configure
the FXS and FXO ports on the Handsets and Outside Lines pages, just like the server
ports. On the Dial Plan page, the system adds port expander FXO ports to the default
service groups.
The system enables creating new custom service groups or modifying existing groups to
include the port expander’s FXO ports.
13.5 Outside Line Call Routes
Each outside line (CO Line, DID Line, SIP Proxy, SIP Gateway, or a Digital Line) has a
RTP Media Range (Port to
Port)
Specifies the range of UDP ports used for Real-Time Transport Protocol
communications. Using a maximum range of values makes the port
expander the most secured from snooping and denial of service
activities. However, when placing remote port expanders behind
third-party firewalls, under certain conditions the UDP port range may
need to be restricted to create mapping rules for each port expander
behind the firewall. See “Remote Allworx Phones and Port Expanders”
on page 143. for more information.
SIP NAT Keep-alive Interval
Some NAT firewalls automatically time out and close connections to
devices. If a remote port expander is behind such a firewall, 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 shorter than the firewall timeout.
SIP Port
UDP port number used for the SIP protocol by the port expander. Use
the default value of 5060 unless the port expander is behind a third-party
firewall and the network requires a different value.
Daylight Savings Time
Specify 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, use the DST setting of its actual location.
Time Zone
Specify the time zone that the handset uses to compute its local time.
Select the use current server setting if the port expander is in the same
time zone as the server. For a remote port expander, use the time zone
of its actual location.
Jitter Buffer Size
Alter the size of the jitter buffer. 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.
Feature Description