17.69. SPCM - Define a speech-compressed trunk group 
Feature:
Voice Compression VC
Function:
The VCM (Voice Compression Module) required for the "Voice Compression - Increase
voice
transfer capacity on S0/S2 links" feature should be set up with a special COT in which
the
following parameters are set:
SPCM = Speech channel compressed and NLHT = No local hold tone, hold tone from remote
system.
IMPORTANT:
With VC, noises occur during toggling due to connection setup/clear
down. The activation of the COT parameter NLHT suppresses the activation and deactivation
of
tones during toggling and consultation.
AMO Interrelationships:
Configure FEASU features, VOICO Configure Voice Compression, etc.
Device types:
VCCOD Digital CO trunk circuit for voice compression with 7 or 15 B channelsVCCONN Digital tie trunk circuit for voice compression
with 7 or 15 B channels
Protocol variants:
Protocols that support the protocol element for limiting compression/decompression
cycles,
e.g. CORNV33, ECMAV2, PSS1V2