ISDN Call Processing Overview

Network

Module

Host

L4L3mCALL_REQUEST

SETUP

CALL PROCEEDING

ALERTING

CONNECT

L3L4mALERTING

CONNECT ACKNOWLEDGE

L3L4mCONNECT

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.

November 2009

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Dialogic 6.2 manual Isdn Outgoing Call, November 322