Dialogic 6.2 Manuale Utente

Ground Start Signaling

November 2009

292

If send_glare_err_event = 0 in the IISDN_ROBBED_BIT_DATA 

structure, the host receives an L3L4mERROR message containing 

the value L3L4errGLARE if the outgoing call attempt fails due to 

glare. Glare occurs when the module attempts to make an outgoing 

call on a channel at the same time an incoming call arrives on the 

channel. The call attempt fails because the network always wins 

channel contention.

During an outgoing call, the host receives an L3L4mPROGRESS in 

response to the L4L3mCALL_REQUEST to start the call. The host 

then receives an L3L4mSEIZE_COMP message if send_seize_comp_

event = 1 in the IISDN_ROBBED_BIT_DATA structure. This 

message is sent after the fixed pause timer expires. No digits are 

collected in FXO ground start mode; the module simply waits for an 

answer timer to expire (if timed_answer_supervision = 1). When the 

timer expires, the host receives an L3L4mCONNECT indicating the 

call is connected.

 shows how the module makes an outgoing call over an 

FXO ground start trunk.

For an incoming call teardown, refer to 

; for an outgoing 

call teardown, refer to