5.37.3.3. More Data Channels or More Speech Channels 
If there is the necessity for an increase of data channels, i.e. during
the night, the number of B channels to be additionally used for data
connections can be increased by directed deactivation of Voice Compression
subunits.
If more B-channels for voice are needed, the deactivated Voice Compression
NCs have to be switched on again.
For a detailed description see Section 57.2.10,
"Deactivation/Activation of Voice Compression", on page 721.
At present, there is no external application which supports this functionality.