17.15. CTLN - Prevent controlled line and trunk selection in an external system 
Feature:
Function:
The COT parameter CTLN prevents the controlled selection of trunks and lines for
network-wide connections.
After the outgoing seizure of a trunk with the 'Controlled Trunk and Line Selection
(CTLS)'
feature, continued dialing is prevented if the CTLN COT parameter is activated and
the SPCM
(speech compression) COT parameter is deactivated in the breakout trunk for the external
system.
AMO Interrelationships:
COT: <CTLS, SPCM>; COS<CTLS>; CTIME: <CTLS1, CTLS2 >:
DPLN <CTLS >
Device types:
Digital tie trunk circuits and CO trunk circuits
Network protocols:
For example, ECMAV2 (CorNet-NQ Issue 2.1 Dec.96 Basic ETSI), PSS1V2 (CorNet-NQ Issue
2.1
Dec.96 Basic ISO/IEC)
EDSGER (EDSS1 protocol for Germany), EDSAUT (EDSS1 protocol for Austria), EDSSUI (EDSS1
protocol for Switzerland), EDSFRA (EDSS1 protocol for France), ETSI (Standard EURO-ISDN)