5.37.2.9. Voice Compression Configuration 
The Nailed Connection between a VCM and a Partner board will be added
with:
ADD-VOICO:PEN1=<vcm-pen>,VCSU=<?>, PEN2=<partner line>,BCHAN=<partner bchan>, INS=Y/N;
Meaning of the parameter INS:
- INS=Y:
After adding a NC it will be activated immediately. Therefore the circuits of VCM and Partner board have to be already locked.
- INS=N:
In this case the NC will not be activated and the VCM B-channels remains locked. The Partner B-channel will not be occupied and stays as a normal S0/S2 B-channel.The VCM B-channels have be activated later with ACTIVATE-VOICO. See detailed description in Section 57.2.10, "Deactivation/Activation of Voice Compression", on page 721.
INFO:
A symmetric configuration of the NCs at both nodes is necessary. See figure in Section 57.1.4.1, "Figures of Symmetric Voice Compression Configuration", on page 714.