User`s guide

Server Software Release Notes – Release 6.9.7.1
300 Main Street • East Rochester, NY 14445 • Toll Free 1-866-ALLWORX • 585-421-3850 • www.allworx.com
© 2009 Allworx Corp. All Rights Reserved
Revised: February 17, 2009
Page 10
Third Party Compatibility Issues
Remote phones and port expanders behind Linksys
®
NAT devices stop functioning
The Linksys BEFSR41 series NAT devices (and likely other models) have a bug where they can remap UDP
ports on 20-minute boundaries. This can cause loss of audio during a call or the inability to place or receive
calls. Multiple phones behind the same device will exhibit the problem much quicker than a single device. For
best results, phone ports (e.g. SIP, RTP range, etc) should be set independently for each phone and statically
mapped through the Linksys device. The SonicWall
®
, Netgear
®
, D-Link
®
and Allworx NAT devices have been
tested and do not exhibit this problem.