Dialogic 6.2 Manuale Utente

ISDN Call Processing Overview

November 2009

322

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.

CALL PROCEEDING

ALERTING

CONNECT

L4L3mCALL_REQUEST

SETUP

L3L4mALERTING

L3L4mCONNECT

CONNECT ACKNOWLEDGE