Dialogic 6.2 manual Outgoing Call Processing, November 283

Wink Start with Feature Group B & D

Outgoing Call Processing

The host receives an L3L4mPROGRESS in response to the L4L3mCALL_REQUEST to start the call. The host then receives an L3L4mRX_WINK message when the module detects a wink from the network. The module waits a period of time (determined by the fixed pause timer) before sending digits. When the timer expires, the host receives an L3L4mSEIZE_COMP message if send_seize_comp_ event = 1 in the IISDN_ROBBED_BIT_DATA structure.

Call Teardown Processing

For an incoming call teardown, refer to Figure 46 at the end of this section; for an outgoing call teardown, refer to Figure 47 at the end of this section.

Wink start with Feature B and D is designed to support transmitting digits other than dial pulse digits. If called_party_digits = 0 in the L4L3mCALL_REQUEST that started the call, the module waits in outdialing state indefinitely. During that time, another device connected to the Brooktrout module over the TDM bus (such as a digital tone generator) is used to outpulse digits to the network. When that device is finished transmitting, the host must issue an L4L3mEND_DIAL message to make the module continue call processing.

After the digits are transmitted, the network acknowledges their receipt by sending a wink to the module. The host receives an L3L4mRX_WINK when this wink is detected. The module then waits for answer supervision from the network (indicating the far end has gone off hook) or for an answer timer to expire (if timed_ answer_supervision = 1). When answer supervision is received or the timer expires, the host receives an L3L4mCONNECT indicating the call is connected.

Figure 28 shows how the module makes an outgoing Feature Group B/D call over a wink start trunk.

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