point-to-point voice & data on dry copper pair (not VoIP

Hi all,

I have a PBX in the HQ - a site connected to the HQ by an extension line of the PBX - a 2.5 Km telephone copper line (dry copper pair).

Is there any modem device I can use at both ends of this copper pair to transmit data & voice (not VoIP) between HQ and the site? even 512K data rate will be acceptable.


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