No ringing tone when dialling out

[gambit]

Thanks for the replies. I managed to sort the problem out. The problem was only when I dialled outside numbers and not when I called internal extensions (Internal extensions had a ringing tone but outside number not). I'm not sure what caused the problem but I did the following and now it is all working correctly.

1. Upgrade base station firmware to latest (25.30.0.50)
2. Upgrade all handsets to latest firmware (26.30.0.50)

At this point there was still no ringing tone when dialling out so I did the following:

3. reset base station to factory settings
4. reset all the handsets
5. reconfigured all the sip accounts and handsets again

Finally there was now a ringing tone when calling outside numbers. Hope this helps other people.