msmithjr1375,
Do you get service order tone when you lift the handset or if you press the speaker button?
If you don't get it when you lift the handset it could mean that the phone is in headset mode. If it is in headset mode then just dial the Headset feature code [Default:317] to turn it back on again.
It could also be that the phone is setup as a House Phone to dial a digit(s) automatically and then you wouldn't hear anything right away. If this is the case you could dial * to try and cancel the feature and see if you get service order tone back.
Thanks,
TE