calls from resale cellular to cable lindlines

Greetings,

This question is being posted on public forums for:  T-Mobile, Tello Mobile, Mint Mobile and Optimum Cable which, like all cable companies, offers a landline-over-cable service.  My hope is that technical experts from these companies will see this and respond. 

This concerns an error that occurs when cellular calls are initiated from RESELLERS of T-Mobile service e.g., Tello and Mint, to Optimum or any other cable company landline.  Here is the issue:

I have Mint Mobile (a T-Mobile reseller) on a Motorola Galaxy AO1 and Tello Mobile (also a T-Mobile reseller) on another phone of the same model.  In my home, I have an Optimum cable provided landline.

When I use either of my cell phones to call my Optimum landline or any other cable provided landline, the ringing cycle starts as normal, but stops abruptly after only 3 rings (as heard over my cell phone's receiver).  When the ringing cycle stops, a message appears on my cell that says "Couldn't complete".  It does this every time, without exception.  Calls made from either of my cell phones to any other wireless carrier, or to any traditional 'Ma Bell' landline, never experiences this issue.

I have tested this error by making calls to my home from other cell phones with various providers which are NOT resale service, and there is never an issue. 

It seems that this problem only occurs when a cell phone, using a resale service, is being routed to a cable provided landline. 

Can anyone advise as to why this is occurring and how it might be resolved?   Gracias.