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Cisco IP Phone 7940G SIP - Can't Register

I am trying to configure a new Cisco IP Phone 7940G to register as a SIP device to an Asterisk server.

My SIP configuration is:

Name: Test

Shortname: 242

Authenticaton Name: 242

Authentication Password: 242

Display Name: Test

Proxy Addres:

Proxy Port: 5060

When I configure a Linksys or sofware phone with these settings it register and works fine, but withe this Cisco 7940G I hear "The number you have dialed is not in service, please check the number and try again" whenever I dial any number (I'm testing with internal extentions and feature codes), the phone does not light up on the Flash Operator Panel either, and the display on the phone has a phone icon with an 'X' next to it, so I don't belive it is registering on the server.

Can anyone advise how I should diagnose and fix the problem?


Re: Cisco IP Phone 7940G SIP - Can't Register

One of the differences between SCCP phones and SIP phones is that SCCP phones won't show their DN until they are registered.

SIP phones, however, will show it when it is still unregistered and can cause confusion on when it is actually registered or not. Make sure that it has properly registered, and try again.

For that, I can't help you with since it's Asterisk

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