Analog Trunk between TWO PABX System

[harmitin]

Hi, We have a strange requirement from our customer to connect two PABX systems over an analog trunk.

Currently, analog phone is connected to PABX A over 1 pair cable. 

Our customer wanted to connect PABX B in place of the Analog phone to have a one-line connection between both PABXs. The purpose of this connection is to allow only calls between PABX users when an access code is dialed.

Could you please help me, what configuration should I proceed to make this interface working?

Client dont want to use SIP trunk to inline with network segregation requirement.

[Jerrytech1]

How is the port configured? Loop, Ground or POTS. Loop would work best with PBX dial tone.

[Elliot Dierksen]

You can use loop start or ground start. What really matters is that both sides of the link are configured to use the same start type. Some PABX models use different cards for loop start versus ground start. If you can do either, my suggestion would be to use ground start. It has better disconnect supervision than loop start.

[Jerrytech1]

You can't use ground start with an analog PBX station providing the dial tone. Single line PBX stations are loop start dial tone.

I agree about the superiority of Ground Start but that would mostly apply Trunks not stations.

[harmitin]

port is configured as pots.

[Jerrytech1]

If the port isn't functioning correctly, you can try rebuilding as Loop.

[Jerrytech1]

Are these systems in the same building?

[harmitin]

Yes, they are in same building.