Tie lines directly link a local DSX-80/160 telephone system with one or more remote DSX-80/160
systems. The link is independent of the telco's switched network. When a local system user seizes a
tie line, they hear Intercom dial tone from the remote system. The user can then use many of the
features normally available to the remote system’s single line telephones, including:
- Dialing Intercom extensions in the remote system.
- Using the remote system's lines for outgoing calls.
- Accessing System Speed Dial numbers in the remote system.
- Using the remote system’s Paging.
Tie Lines require a T1 PCB and Tie Line service from the telco.