How to determine where the digital line is?

Question

Telephony

Hello. There is a PBX in the office (KX-TD123), one digital phone is connected to it (for setting up the PBX), the rest are analog. There was a need to connect another digital phone (KX-T7431). There is also a cross panel, where the whole business is started from the automatic telephone exchange, from the panel to the cabinets. I have never dealt with telephony before.
Number 130 has been wired at the place where you need to put a digital telephone. The cable has 4 cores, but only 2-3 are connected to the panel. All 4 are needed for a digital phone. Question. How to find the digital line 130 in the panel? Well, or how do you understand a digital line or an analog one?
I know that it is easier to hire a telephone operator, but I would like to figure this out myself.
UPD:
Pokapalsssya in the cross, found a digital line with the number 115, but the number 115 is already used on the analog. Is it possible to programmatically reassign the digital line from 115 to 130?

Answer 1

on these automatic telephone exchanges (by the way KX-TD1232) ports of internal lines universal. you need to start looking at the PBX itself - at the 6-pin connectors on the board, where they are generally embroidered.