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Loop Start Signaling
November 2009 310
event = 1 in the IISDN_ROBBED_BIT_DATA structure. This
message is sent after the fixed pause timer expires. When the timer
expires, the host receives an L3L4mSEIZE_COMP message if send_
seize_comp_event = 1 in the IISDN_ROBBED_BIT_DATA structure.
FXS ground start supports 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.
After the digits are transmitted, the module 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 44 shows how the module makes an outgoing call over an
FXS ground start trunk.
Call Teardown Processing
In this mode, an incoming call teardown cannot be detected; the host
must determine when the call is inactive (that is. no data) and
initiate an outgoing call teardown. For an outgoing call teardown,
refer to Figure 45.