
APPENDIX
Protocol Data Mode
2.10
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19.01.2007
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5.1.9 Call Control Information Elements
5.1.9.1 General
Description
The call control protocol is an application in the command channel. It is identified by the
value prot=0 in the HDLC ADDR byte (see section 5.1.3.2).
Through the call control protocol host and module exchange all necessary signalling
information for establishing and releasing calls.
Establishing a call implies setting-up a DECT connection, an associated LAP protocol
instance and binding both to a free HDLC data channel. This is referred to as call entity
which is identified by a call handle. The call handle is allocated by the module as part of the
call establishment procedure.
The call handle is used in the header of each HDLC frame in order to identify the call entity
the data belongs to (see section 5.1.3.2).
Releasing a call implies closing-down the associated DECT connection and the LAP protocol
instance. When a call is released the call handle is freed.
Each call control command is sent in the information field (see section 5.1.6) of an I-frame.