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Wink Start with Feature Group B & D
November 2009 283
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.