sundance-communications.com/forum Forums TDM Business Telephone Systems Toshiba Telephones & Systems Compatibility with Verizon FIOS phone lines

This has been an ongoing issue for me. I have a CTX100 Toshiba Phone system. It has worked great for something like 20 years. My issue is with my Verizon FIOS phone lines. Sometimes when calls come in and the caller hangs up, the Toshiba phone system still rings forever. At least until I pick up the phone just to hear a dial tone. If it helps, I have an emergency phone that bypasses the Toshiba phone system. That one correctly stops ringing. I assume it must be a setting in the phone system. Does anyone have experience with such an issue? I am fine working with the settings in eManager.

Since FIOS is a VoIP type service you have an ATA between your phone equipment and the digital line. See if you are dropping voltage when the calling party hangs up. This sounds like a CPC issue, which the disconnect signal would be coming from the ATA once provided at the digital level by the phone company.

Not sure why it would ring forever. Should only ring while sensing ring voltage, then after the number of seconds in the Call Abandon Timer. Check under Trunk Assignments>Timers. It can only be set for 6 or 8 seconds, so you'd normally only get 1 or 2 rings after the caller hangs up.

Don't disagree, but the ring voltage comes from the ATA. Not familiar with how the timers are set on this system, but that would be a work around. So, your solutions could work if the timers aren't set. That doesn't fix the CPC issue though.

There may not be an ATA involved. Verizon Fios typically provides analog phone lines, if needed, through their NID. That may technically be an ATA, but it is built into their box. Also, in my experience, CPC is not provided during the ring phase of a call, only during an active call. Even if it was, the Toshiba system would not detect it because it only acts on CPC during an active call. For an incoming call, the only thing the Toshiba is sensing is ring voltage. When the ring voltage stops, after the abandoned call timer, the internal phones should stop ringing.

CPC would be activated when the calling party hangs up. That must not be happening otherwise it wouldn't keep ringing. There has to be an ATA or analog phone service wouldn't work. With fiber the ATA is most likely in the ONT. This is not new technology ATA's have been provided on digital feeds for quite some time.

Do people think there is something wrong with the Verizon box in my basement? What should I try?

Under Trunk Assignments>Basic, make sure Release Supervision and Answer Supervision are both at the default - Not Received. Those were for CAMA trunks which I never saw. You could also try changing the External Ring Repeat, that was mainly used for Centrex trunks. You could also try removing the cord plugged in to the CO port while a call is ringing in and see if the extensions stop ringing. If they do continue ringing, there is something wrong with the system. Maybe just a CO port, if you have an available port try moving to a different one. You'd also have to change programming for the line to that port.

The only way to know if you're getting CPC is to test it. You'll have voltage across the line and when CPC is received the voltage will momentarily drop to zero. You can try what's been suggested by LarryH2, personally I'd rather see if I'm getting the correct conditions from my dial tone provider before changing setting in the phone system, but that's just me.

Thank you. Verizon fixed the problem for me. CPC had to be turned on. This has been a problem for years.