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Loop Start Signaling
November 2009 311
Figure 43. FXS Loop Start – Incoming Call Timing Diagram
IISDN SMI MESSAGES: L4L3mALERTING_REQUEST or L4L3mPROGRESS_REQUEST L4L3mCONNECT_REQUEST
L3L4mPRE_SEIZE L3L4mSETUP_IND
IISDN TIMERS:
hooktimer_onhook_rls
modified_in_rls_timer
hooktimer_onhk_mod_in_rls
first_indigit_timer
dptimer_immed_dela
y
RECEIVE HOOKSWITCH, FXO:
A
Bi
t
B
Bi
t
TRANSMIT HOOKSWITCH, FXS:
NOTE: No digits are collected on the near end in this mode.
A
Bi
t
B Bit
NOTE: This diagram is designed to give the reader a general understanding of the sequence of events for this robbed
bit protocol over time. The timers and spacing on this graph are not proportional to the actual events that occur.
Revised 10-Nov-98
Revision 1.3
RECEIVED BITS,
TRANSMITTED
Revised