Dialogic 6.2 Manuale Utente

Loop Start Signaling

November 2009

304

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 seize from the far end (FXS end). The module then collects 

dial pulse digits from the network; the maximum number of digits 

the module expects to receive must be specified in the max_

incoming_digit_count field. The digits are reported to the host in an 

L3L4mSETUP_IND message. To answer the call, the host must 

issue an L4L3mCONNECT_REQUEST message. 

 shows 

how a Brooktrout module processes an incoming call received over 

an FXO loop start trunk.

During an outgoing call, the host receives an L3L4mPROGRESS in 

response to the L4L3mCALL_REQUEST to start the call. The 

module automatically transmits a ringing pattern using the B 

signaling bit. When the far end goes off hook, 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