Dialogic 6.2 manual Outgoing Call Processing, Call Teardown Processing, November 292

Ground Start Signaling

Outgoing Call Processing

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.

Figure 32 shows how the module makes an outgoing call over an FXO ground start trunk.

Call Teardown Processing

For an incoming call teardown, refer to Figure 33; for an outgoing call teardown, refer to Figure 34.

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