Common Channel And Voice Channel Link Control - Philips SOPHO 2000 IPS User Manual

Common Channel and Voice Channel Link Control

When the call is a regular ISDN call, or when there is no call on the PBX, the common signaling channel
and the voice channel for the virtual tie lines are disconnected.
If the virtual tie lines are all busy, or when the virtual tie lines cannot be connected due to a line fault, a
call is transmitted to the opposite office via ISDN network as a regular ISDN call not as a CCIS call.
When a predetermined time passed after all calls finish, the voice channels and common signaling channel
are released and the CCIS link is disconnected. The release timer is set by system data programming for
the common signaling channel and voice channels.
Release Timing of Virtual Tie Line and CCIS Link
Voice ch 1 (B2)
Voice ch 2 (B3)
CCIS link (B1)
n, m : Release timer
2.4 seconds-maximum 28 minutes
VT : Virtual Tie Line
n second
n second
Set VT (B3)
Set VT (B1)
Set VT (B2)
Release CCIS (B3)
Release CCIS (B2)
– 22 –
CHAPTER 1 GENERAL INFORMATION
OUTLINE OF EVENT BASED CCIS
m second
Release VT (B1)
Release VT (B3)
Release VT (B2)
NWA-008852-001 Rev.5.0
98ch1001.fm