Dialogic 6.2 Manuale Utente

Ground Start Signaling

November 2009

296

To configure a Brooktrout module for FXS ground start signaling, 

the host must issue an L4L3mENABLE_CAS with an IISDN_

ROBBED_BIT_DATA structure that contains the following settings:

„

in_trunk_type = IISDNtt5ESS_GDSTART

„

out_trunk_type = IISDNtt5ESS_GDSTART

„

max_incoming_digit_count = 0 (no digits collected)

„

timed_answer_supervision = 1 (timer expiration indicates far 

end answer)

„

fgb_fgd_mode = 0 (not used)

The remaining settings are described in the context of incoming and 

outgoing calls in the subsections that follow.

During an incoming call, the host receives an L3L4mPRE_SEIZE 

message if send_preseize_event = 1 in the IISDN_ROBBED_BIT_

DATA structure. This message is sent when the module detects an 

incoming seizure. No digits are collected in FXS ground start mode; 

to answer the call, the host must issue an L4L3mCONNECT_

REQUEST message.

 shows how a Brooktrout module processes an incoming 

call received over an FXS ground start trunk.