Allworx 9212 User's Guide download pdf (Page 13)

Server Software Release Notes – Release 6.8.3.1

300 Main Street • East Rochester, NY 14445 • Toll Free 1-866-ALLWORX • 585-421-3850 • www.allworx.com

Revised: May 16, 2008

Page 11

Third Party Compatibility Issues

Remote phones 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.

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Allworx 9212 User's Guide Page 13