delayed connection of inbound calls

[rob1452]

Using Avaya IP office with 8.1 version 73 connected to Bell (ONT) Optical Network Terminal fibre to analog lines.
Inbound calls ring on the IP office , you answer however the person that generated the calls phone is still ringing 5 to
6 seconds later you hear a click then the call is connected. It is also dropping calls and there is the occasional
phantom ringing. If I take it to 9.0 version 4.0 will this solve the issue?

 

[amriddle01]

I doubt it, it sounds like the lines not detecting the call being answered correctly

 

[vtphoneguy]

Test the lines in front of the IPO with a butt set. Determine if the issue persists with the phone system out of the equation.