Need suggestions for a 2-Line Cordless Phone

I need a 2-Line cordless phone so that I can hookup both the Intercom (building) as well as the MTNL line.

1. The idea is to be able to take both intercom and outside calls from anywhere in the house.
2. Capability to have 2 different ringtones for the 2 lines. So that one knows beforehand if its an intercom or an outside call.
3. Preferably 5.8 Ghz so that it doesnt interfere with the typical wireless computer devices at home.
 
I have used 2 lines phones of 2.4ghz and 5.8ghz.
The panasonic 2.4ghz KX-TG2480 phone cost about 4k in grey or 5k in showroom,but the main unit doesn't have a lcd or numbers or a speakerphone,so i returned it and got the 5.8ghz TG6700 this one costs about 6k in grey and has a speaker phone and numbers and answering machines,on can add upto 8 handsets.

But i suggest the new DECT 6.0 phones KX-TG9381T and KX-TG9391T should cost above 6k in grey market these operate in 1.9ghz and won't interfere with any devices.
 
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