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== Sample call flow == This is a very basic call flow involving only two telecom switches which exchange the ISUP messages. The subscriber interfaces are not covered here and are only listed for a better understanding. ''' A subscriber telco switch A telco switch B B subscriber''' Off hook Dial digits ---> -- IAM --> -Ringing -> <-- ACM -- Off hook <-- ANM -- ----------------------- Conversation ----------------------- On hook -- REL --> On hook <-- RLC -- Detailed call flows are provided in ITU-T Recommendation Q.784.1.{{Sfn | ITU-T | 1999b}} Below is a detailed exchange of ISUP messages involving two ISDN telecom switches. The report was from an Alcatel S12 digital switch. BENIN 2005-07-15 16:49:16 FR 00121 00000000 G159CA01 L6X8AA47 SWA-ORJ-OBSERVATION SYSTEM REPORT ------------------------------------------------------------------------- OBSERVATION/CALL SAMPLING SUCCESSFUL ----------------------------------------------------------------------- TYPE OF OBSERVATION: ORIGINATING DATE = 2005-07-15 TIME = 16:48:23:09 CALLING DN = 52250000 CALLING CAT = PRIORITY SUBSC INC EQ NBR = H'31 & 1 RCVD DIGITS = 012625729 CALLED DN = 012625729 OTG TRNKGRP = LAGOS_SC OTG EQ NBR = H'1111 & 16 BEARER = AUDIO31 XFER MODE = CIRCUIT SWITCHED CAUSE = NORMALUN TERM SEIZED = 0: 0: 2: 3 THROUGH SWITCH = 0: 0: 4: 3 ANSWER = 0: 0:14: 6 RELEASE = 0: 0:46: 3 TAXATION INFO ------------- CHARGED DN = 52250000 CALL DURATION = 0: 0:31: 6 COUNTS = 2 TARIFF GRP = 4 TARIFF ID = 7 RATE = 20 RANDOM CNT = 0 SURCH UNITS = 0 CAT UNITS = 0 TARIFF REG = 1 RECEIVER SZD = 0: 0: 0: 0 RECEIVER RLSD = 0: 0: 4: 2 REC EQ NBR = H'13 & 6 REC RLS INFO = FORCED RLSE REC SIGNAL DIRECTION TIME ------------- --------- ---- REG-I-10 RECEIVED 0: 0: 1: 3 REG-I-1 RECEIVED 0: 0: 1: 6 REG-I-2 RECEIVED 0: 0: 1: 8 REG-I-6 RECEIVED 0: 0: 2: 1 REG-I-2 RECEIVED 0: 0: 2: 3 REG-I-5 RECEIVED 0: 0: 2: 5 REG-I-7 RECEIVED 0: 0: 3: 0 REG-I-2 RECEIVED 0: 0: 3: 3 REG-I-9 RECEIVED 0: 0: 3: 7 INC SIG TYPE = ANALOG-SUBSCR SIGNAL DIRECTION TIME ------------- --------- ---- SEIZURE RECEIVED 0: 0: 0: 0 DIAL-TONE SENT 0: 0: 0: 0 CLEAR-FW-FW RECEIVED 0: 0:46: 1 OTG SIG TYPE = ISUP-NAT MESSAGE DIRECTION TIME LENGTH ------------- --------- ---- ------ IAM SENT 0: 0: 2: 3 29 85014040007000010020000B03020604019010620A0603132552000000 SAM SENT 0: 0: 2: 4 13 85014040007000020200028002 SAM SENT 0: 0: 2: 6 13 85014040007000020200028005 SAM SENT 0: 0: 3: 1 13 85014040007000020200028007 SAM SENT 0: 0: 3: 4 13 85014040007000020200028002 SAM SENT 0: 0: 3: 8 13 85014040007000020200028009 ACM RECEIVED 0: 0: 4: 1 15 850141000070000616040129010100 ANM RECEIVED 0: 0:14: 6 18 8501410000700009012D02000039022DC000 SUS RECEIVED 0: 0:45: 4 10 850141000070000D0100 REL SENT 0: 0:46: 1 13 850140400070000C020002849F RLC RECEIVED 0: 0:46: 3 9 850141000070001000 UNSOLICITED REPORT NO = 00121
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