10.30.3.3. Terminal Portability 
The "Terminal Portability" feature allows a call to be parked temporarily.
The call is parked in the node by specifying a two-position identification
number. As long as the call is not unparked again, the subscriber can
continue to replace or decouple terminals or resume the call from another
terminal on the bus by specifying the identification number.
A call can only be parked for a duration of two minutes.
- Configuration
The TP parameter for the voice service has to be activated in the COS and bit 6 in byte 3 of the assigned option table must be set.
- Restriction
If the subscriber is a member of a call pickup group, the call can no longer be parked in the pickup group. However, a parked call can be transferred from the pickup group.