Help converting an audio intercom into a handsfree audio intercom

[nanomess]

Hi,
I have a BPT Agata C200 4-wire internal audio intercom machine (please see the attached pdf for info), that I'd like to replace with a cleaner looking handsfree system. Unfortunately, no such system exists that is compatible with my outdoor BPT unit. The C200 is literally the only compatible model with the outdoor BPT unit. I also own a Siedle AIB 150-0 which is a 2-wire handsfree indoor audio intercom.

I'm looking for someone (preferably UK/EU based, since I'm here) that can help modify the Siedle so it can work with my 4 wire system, or alternatively, modify the internals of the Agata C200 and fit in the Siedle casing so it works as a handsfree setup.

Thanks,
Farbod

 

[FvM]

A telephone hybrid is needed to translate 2 wire to 4 wire. Bias and gain may be needed in addition.

I presume you have no info about used audio levels and DC bias, need to measure it in system.

 

[nanomess]

Hi,
Thanks for the response.
Yes, you're absolutely right. How can I find out this information?