PABX system TC200-48 apartment intercom has 48 extension lines, 2 TNT lines, boss/secretary calls, caller ID intercom, call forwarding, call pickup remotely, auto-extension number display, conversation interrupt and break, 3rd party conference calls. 48 Extension Lines: Supports up to 48 internal extensions for connecting phones or intercom units. 2 Trunk Lines: Provides 2 external telephone lines for making and receiving outside calls. ISDN / Analog Support: Compatible with both ISDN and analog telephone communication systems. Caller ID Intercom: Displays caller information during incoming extension or external calls. Boss/Secretary Function: Allows convenient communication and call management between designated boss and secretary extensions. Call Forwarding: Automatically redirects incoming calls to another extension when needed. R ...