IP Phone Up and Down

[dizzyphil]

Gents,

Have a 406, 3.0.69 with a Linksys router at the 406 site and remote site. Phone type is 5602. The routers are Identical and I have a vpn tunnel set up. The tunnel never goes down, but the 5602 drops out and goes into Discovery. When the phone is up, it works great. The phone going into discovery happens on a regular basis and the customer has to unplug the phone to reset it. I have tried two other phones to no avail. Have tried different ports on the router (only 4 ports). PC's on the other ports work fine.

Any help or suggestions would be great.

Dizzy

 

[Morrack]

I've become a real big fan of Cisco PIX's for this kind of application. I know cisco bought linksys but it's still a consumer product at heart. Some things are just worth spending more money on.

Now, having said that, it's also possible that you're having intermittent loss of service on your internet connection at one of the locations. Are you on DSL? You can have brief interuptions and not even notice it from a data perspective, but IP hardphones will go into discovery mode if they lose contact with the IPO.



Peter Sherwood
Morrack Consulting
Affordable World Class Off-site Backup!

http://www.morrack.com

 

[dizzyphil]

The home internet connection is cable (midsouth roadrunner) from time warner. I have checked the logs on both vpn linksys routers, and neither one lose the tunnel. Is there anything particular in monitor I should be looking for???

Phil

 

[phaseburn]

Well, losing the tunnel, and losing contact with the IPO are totally different...

I've set up tunnels before that last through a cable modem restart (~ 2 minutes) with no problems, yet the IP hardphones head over to discovery mode after a much much shorter time, usually around a second or two.

Packet loss could be causing this, as well as a sudden spike in latency. Try running a few traceroutes when the phone says "Discovering" if you possibly can, it may shed some light on the situation. Generally, though, any connection interuption, however brief, will cause that, though tcp is a lot more robust and likely won't take down your VPN connection...