Nortel DMS 100 Series Maintenance Manual page 106

4-16 RSC-M Signaling and Communications
2. Originating exchange to terminating exchange After the originating
3. Terminating exchange to AMC When the terminating exchange receives
4. Terminating exchange to originating exchange After the last DTMF digit
5. AMC to terminating exchange When the subscriber answers the call, the
6. Terminating exchange to originating exchange When the terminating
7. Originating exchange to AMC When the originating exchange receives an
297-8223-550 Standard 04.02 November 2000
exchange receives the first DTMF digit the T2 timer stops and T3 starts.
This action restarts each time the exchange receives a DTMF digit.
exchange receives all DTMF digits and selects an outgoing route, the
exchange sends an IAM the terminating exchange. Digits analysis can
define the number length, in which event the T3 timer stops. In the event
of a number length that is not known, the expiration of the T3 timer
indicates the last digit. After the originating exchange sends an IAM the
T7 timer starts.
an IAM, the exchange sends a seizure signal to the AMC node. The
system expects a dial delay signal within 2.5 s for a minimum duration of
30 ms. If the signal does not arrive during that period the system interprets
the line as defective, and the call is routed to a treatment. After the dial
delay signal is received, the proceed to send signal is expected within 2.5
s. When the proceed to send signal is received, DTMF digits are
outpulsed to the AMC node.
is outpulsed, the terminating exchange sends an ACM message to the
originating exchange. Speech conditions are setup. When the originating
exchange receives the ACM message, the T7 timer stops and the T9 timer
stops. This action sets up speech conditions.
AMC node sends a call established signal to the terminating exchange.
exchange receives a call established signal, the exchange sends an ANM
message to the originating exchange.
ANM message, the exchange stops the T9 and T1 timers. The originating
exchange sends a call established signal to the AMC node.