User Guide

ISDN Router Manual V.1.1
79
12. Supplementary Service Function
12.1 Definition
AT$CI1
Set inner communication enable
AT$CS1
No Network/Local supplementary service function provided
AT$CS2
Only Network supplementary service function provided
AT$CS3
Only Local supplementary service function provided
LIT
Local incoming
tone
♦ 400Hz tone
♦ 0.125sec on, 0.1sec off, 0.125sec on, 0.1sec off,
3.55sec off repeated
BT
Busy tone
♦ 400Hz tone
♦ 0.5sec on, 0.5sec off continually
DT
Dial tone
♦ 400Hz tone
♦ Continual
RBT
Ring-back tone
♦ Receive from Network ISDN switch
IRBT
Inner ring-back
tone
♦ 60ms on, 50ms off, 60ms on, 3250ms off,
repeated
♦ 400 HZ tone
IR
Inner ring
♦ 20Hz ring signal
♦ When detects an inner communication and
sending inner ring signal to TEL-A/B
♦ Ringing period is same as IRBT
ICR
Incoming ring
♦ 20Hz ring signal
♦ When accepts an incoming call and sends ring
signal to TEL-A/B
♦ Ringing period is 1sec on, 2sec off repeated
HT
Holding tone
♦ Send by Network ISDN switch
TA1 / Router1 TA2 / Router2
A
B
C
D
ISDN