My phone does not ring

Mitchell,
I did that but that did not work.
What I noticed that if I have multiple extensions on the phone and call from any but first from the top on the phone the other phone will ring ???!!!!
What is wrong and how to resolve it?

I'm having a similar problem here.

I have some ip650's and some ip330's

For this example lets say we have 3 phones: Ext 1,2,3

I call: 1 -> 2 it rings
1 -> 3 it doesnt ring (but light flashes)
2 -> 3 it rings

I'm pretty confused why a phone would ring when called from one extension - but not another.

Any help with this would be greatly appreciated.

Thanks in advance,

Mike L.