[600MRG] OFF Topic - Need info for toroid to choke RF on phoneline

[Andy - KU4XR]

Hello Gentlemen:

I am needing a toroid that will choke off 2.5 KW on 1390 KHz
on a phoneline in the TX building connected to a dial up 
remote control unit.

What material is good for this , and sources to obtain it.

Thanks for suggestions: 73

Andy - KU4XR