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ISDN Call Processing Overview
November 2009 322
Figure 49. ISDN Outgoing Call
Call Proceeding (L3L4mCALL_PROCEEDING) is reported to the
module but is not automatically reported to the host via the Bfv API.
In order to retrieve this message, set the field below to 1 in your
ENABLE_PROTOCOL message:
143.data.enable_protocol.level3.cnfg.q931.report_incoming_callproc=1
The default is that the stack sends a CONNECT ACKNOWLEDGE
upon receiving a CONNECT. If you do not want to automatically
respond in this manner, set the field below to 1 in the ENABLE_
PROTOCOL message:
l43.data.enable_protocol.level3.cnfg.q931.no_tx_conn_ack = 1
You can specify that, if a desired B-Channel to establish a call on is
unavailable, another available B-Channel, which is chosen by the
module, will automatically be used. To do this, set l43.data.call_
req_data.preferred = 1 to enable this feature in the CALL_
REQUEST message.
Network Module Host
CALL PROCEEDING
ALERTING
CONNECT
L4L3mCALL_REQUEST
SETUP
L3L4mALERTING
L3L4mCONNECT
CONNECT ACKNOWLEDGE