June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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This is the Title of the Book, eMatter Edition
Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.
You lose the dial-tone every few days or so, and you can’t receive any calls from the PSTN
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You lose the dial-tone every few days or so, and you can’t receive any calls
from the PSTN
This problem usually occurs if the access router that connects to your Internet ser-
vice provider is configured for DHCP, and its IP address has changed because the
router’s DHCP lease expired. The net effect is that the ATA’s signaling socket is bro-
ken, and the ATA has no way of knowing it (remember, UDP is connectionless). So,
the ATA must be rebooted in order to reestablish a valid socket. The best way to
eliminate this problem is to get a static IP address from your ISP, or figure out a way
to power-cycle your ATA daily during off-hours. Some TSP-provided ATAs have
firmware that works around this problem. Contact your TSP to be sure.
Pay attention to the obvious…
While writing and editing of this book, my editor and I were communicating by email
about a VoIP TSP service. The editor was about to try it and was hooking up the shiny
new ATA the TSP had just shipped him. He plugged his analog phone into the ATA,
plugged in his Ethernet cable, and powered the ATA up. After a few minutes, he lifted
the receiver, hoping to hear the dial-tone, but instead all he heard was silence.
So he looked over the ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.