User`s guide

Allworx Server Administrator’s Guide Version 7.6

1-866-ALLWORX * 585-421-3850 Page 147

www.allworx.com

Revised: 11/22/13

17.4 Phones at Different Remote Sites, Each

with a Firewall

This case is very similar to “Multiple Remote Devices behind the Same Firewall” on

page 145. The difference is doing the mappings on each site firewall. Map the correct

RTP port range for the device that is on the configured firewall.

In addition, map the BLF port (2088) for one device on each firewall.

17.5 Remote Phones Cannot Receive Pages

While regular calling and intercom calling works fine, paging remote phones does not.

Sending pages from the remote phone works, but users do not hear the zoned or

overhead pages at the remote phone. In order to enable paging to a remote phone, set

up a VPN between the Allworx server and the remote phone.

Below describes the Allworx server settings changes. This document does not cover the

steps for configuring the site firewall for the VPN due to the variations.

there are three parameters to configure where the server transmits zoned pages:

• Paging Base IP Address – This is the multicast base IP address used by the

system. Each paging zone uses the base address plus an offset. Zone 0 (the

overhead zone), uses an offset of 0, zone 1 uses an offset of 1, etc. For

example, if the base address were set to 239.255.10.0, then zone 2 would use

multicast IP address 239.255.10.2.

• Paging Port – This is the UDP port number that the packets are sent to. All

zones use the same port number, but each has its own multicast IP address.

• Paging Max Hop Count – This value controls the time-to-live (TTL) count in the

IP header of all paging UDP/RTP frames. Typically, this value is set to 1 so that

the packet is not sent beyond the local subnet. However, if there are multiple

subnets with phones, increase this value.