Allworx 24X Bedienungsanleitung PDF herunterladen (Seite 28)

VoIP White Paper

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Revised: February 8, 2007

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attendant mechanism should always work. It can be applied individually to each station to isolate the devices

that have configuration or connectivity concerns.

14.7 Mapping ports through remote phone firewalls

When an Allworx server has remote phones at multiple sites and each site has a NAT/Firewall device between

the phone and the Internet, the remote phone’s RTP ports must be statically mapped through the firewall if you

want to call each other. It is not necessary to do this if remote phones only need to call the main office (and not

each other). The steps to perform this operation vary by the type of firewall that the remote phone uses, but the

basic goal is to map a range of UDP ports on the firewall’s IP address to the LAN address ports of the IP

phone. The Allworx server’s admin page for each handset allows you to control the range of ports the phone

will use for RTP sessions under UDP. On the firewall product’s configuration page, you need to map those

same ports (one-to-one) through the firewall – thereby allowing access from the WAN to LAN through those

ports. Some products call this “DMZing” those ports or “port mapping.” The phone’s LAN IP address must also

be entered into this firewall configuration page, so is it wise to make sure this address will be fixed.

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