ISDN Line Interface / ISDN Protocol

• ISDN basic rate "S/T" interface
• Point to point and multidrop passive bus 
• Comply with ETSI standard              

Multiple Call Handling Capability:

• Outgoing Caller, Overlap sending, Semi-Enbloc
• Incoming call, display incoming telephone number  

LCD Display:

• Show status
• Show current date and time
• Show message from network  

Speaker phone:

• Group listening
• LED Indication  

Memory Dial:

• Two-touch memory operation
• 20 memory sets

Multiple ring patterns DTMF on B-channel Ringer volume control Receiver

• volume control

Caller ID

• Record telephone number
• Record date and time

Date/Time display (Display date, hour & minute)

Last number redials

Line status display

Plug and Play

Block dial

Pre-date

Change broker telephone

Charge counter

Hot line

Key pad

protocol Message LED