603:(STP) which only performs MTP message routing functionalities and a Signaling End Point (SEP) which uses MTP to communicate with other SEPs (that is, telecom switches). MTP3 is also responsible for network management; when the availability of MTP2 data links changes. MTP3 establishes alternative links and re-routes traffic away from failed links and signaling points and propagates information about route availability through the network. Also controls traffic when congestion occurs.
22:
405:
MTP1 represents the physical layer. That is, the layer that is responsible for the connection of SS7 Signaling Points into the transmission network over which they communicate with each other. Primarily, this involves the conversion of messaging into electrical signal and the maintenance of the
417:. The Physical interfaces defined include E-1 (2048 kbit/s; 32 64 kbit/s channels), DS-1 (1544 kbit/s; 24 64 kbit/s channels), V.35 (64 kbit/s), DS-0 (64 kbit/s), and DS-0A (56 kbit/s).
595:
MTP3 provides routing functionality to transport signaling messages through the SS7 network to the requested endpoint. Each network element in the SS7 network has a unique address, the
1178:
149:
611:
567:
485:
406:
physical links through which these pass. In this way, it is analogous to the Layer 1 of ISDN or other, perhaps more familiar, protocols.
222:
669:
372:
337:
174:
465:
MTP2 provides flow control, error detection and sequence checking, and retransmits unacknowledged messages. MTP2 uses packets called
1057:
B-ISDN ATM adaptation layer — Service specific connection oriented protocol in a multilink and connectionless environment (SSCOPMCE)
244:
105:
86:
43:
36:
58:
1067:
B-ISDN ATM adaptation layer — Service specific coordination function for signalling at the network node interface (SSCF at NNI)
65:
247:. MTP is responsible for reliable, unduplicated and in-sequence transport of SS7 messages between communication partners.
72:
1193:
289:
Different countries use different variants of the MTP protocols. In North
America, the formal standard followed is
54:
32:
600:
474:
215:
140:
119:
681:
153:
589:
478:
470:
1117:
Message transfer part level 3 functions and messages using the services of ITU-T Recommendation Q.2140
297:
1146:
Signaling System 7 (SS7) Message
Transfer Part 2 (MTP2) — User Peer-to-Peer Adaptation Layer (M2PA)
677:
79:
1037:
Architecture framework for the development of signalling and OA&M protocols using OSI concepts
657:
534:
functional level for narrowband signalling links and, with only minor modifications described in
309:
240:
208:
599:(PC). Message routing is performed according to this address. A distinction is made between a
131:
286:
for MTP3. These tests are used to validate the correct implementation of the MTP protocol.
493:
453:
181:
312:
stack can be separated into four functional levels: Level 1 through Level 3 comprise the
484:
Access to the signalling link functional level's service interface can be provided over
673:
606:
Access to the signalling network functional level's service interface (as described in
193:
157:
1167:
Signaling System 7 (SS7) Message
Transfer Part 3 (MTP3) — User Adaptation Layer (M3UA)
1157:
Signaling System 7 (SS7) Message
Transfer Part 2 (MTP2) — User Adaptation Layer (M2UA)
1187:
625:
MTP Level 3 is tested using the protocol tester and test specifications described in
499:
MTP Level 2 is tested using the protocol tester and test specifications described in
165:
847:
Functional description of the message transfer part (MTP) of
Signalling System No. 7
1047:
B-ISDN ATM adaptation layer — Service specific connection oriented protocol (SSCOP)
812:
793:
777:
761:
745:
712:
436:
functional level for narrowband signalling links. For broadband signalling links,
394:
functional level for narrowband signalling links. For broadband signalling links,
1162:
1152:
1141:
1130:
957:
Network element management information model for the
Message Transfer Part (MTP)
21:
462:
ensures accurate end-to-end transmission of a message across a signaling link.
596:
1102:
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615:
582:
489:
449:
360:
356:
352:
448:. The signalling link functional level may also be provided using the
347:
There is no one-to-one mapping of MTP Levels 1 through 3 onto the
275:
251:
144:
469:
to transmit SS7 messages. There are three types of signal units:
1007:
Signalling System No. 7 test specification — General description
977:
Monitoring and measurements for
Signalling System No. 7 networks
817:
Relationship between SS No. 7 Functional Levels and OSI Layering
619:
585:
579:
294:
290:
136:
917:
Assignment procedures for international signalling point codes
15:
750:
Functional diagram for the SCCP in
Signalling System No. 7
293:
T1.111. In Europe, national MTP protocols are based on
728:
See for example, RFC 3331 and RFC 3332 for the usage
444:
describe the signalling link function referred to as
1097:
Signalling transport converter on SSCOP and SSCOPMCE
967:
Network element information model for MTP accounting
538:, for broadband signalling links. The functions of
192:
180:
164:
130:
1087:Signalling transport converter on MTP3 and MTP3b
1135:Framework Architecture for Signaling Transport
947:Overview of Signalling System No. 7 management
837:Introduction to CCITT Signalling System No. 7
351:. Instead, MTP provides the functionality of
216:
8:
927:Hypothetical signalling reference connection
897:Message transfer part signalling performance
692:(that is, MTP to MTP Users) is described in
578:functions can also be provided by using the
402:describe the signalling data link function.
118:
808:
806:
371:that MTP does not provide, is provided by
223:
209:
877:Signalling network functions and messages
274:. Tests for the MTP are specified in the
106:Learn how and when to remove this message
937:Simplified MTP version for small systems
705:
660:stack are all directly, or indirectly,
1107:Signalling transport converter on SCTP
987:Signalling System No. 7 protocol tests
117:
42:Please improve this article by adding
813:ITU-T Recommendation Q.1400 (03/1993)
794:ITU-T Recommendation Q.1400 (03/1993)
379:Signalling Data Link Functional Level
250:MTP is formally defined primarily in
7:
1077:Generic signalling transport service
778:ITU-T Recommendation Q.700 (03/1993)
762:ITU-T Recommendation Q.700 (03/1993)
746:ITU-T Recommendation Q.711 (03/2001)
588:protocol, described in RFC 4666, in
544:Generic Signalling Transport Service
409:MTP1 normally uses a timeslot in an
375:or other Level 4 parts (MTP users).
519:Signalling Network Functional Level
656:. The remaining components of the
245:Public Switched Telephone Networks
14:
421:Signalling Link Functional Level
340:are together referred to as the
243:(SS7) used for communication in
20:
1027:MTP Level 3 test specification
1017:MTP Level 2 test specification
542:may also be replaced with the
1:
1103:ITU-T Recommendation Q.2150.3
1093:ITU-T Recommendation Q.2150.2
1083:ITU-T Recommendation Q.2150.1
1073:ITU-T Recommendation Q.2150.0
548:ITU-T Recommendation Q.2150.0
367:. The part of layer 3 of the
44:secondary or tertiary sources
993:ITU-T Recommendation Q.755.1
963:ITU-T Recommendation Q.751.3
953:ITU-T Recommendation Q.751.1
887:Signalling network structure
664:. Some examples of parts at
1113:ITU-T Recommendation Q.2210
1063:ITU-T Recommendation Q.2140
1053:ITU-T Recommendation Q.2111
1043:ITU-T Recommendation Q.2110
1033:ITU-T Recommendation Q.1400
684:. The services provided to
536:ITU-T Recommendation Q.2210
438:ITU-T Recommendation Q.2140
396:ITU-T Recommendation Q.2110
1210:
1023:ITU-T Recommendation Q.782
1013:ITU-T Recommendation Q.781
1003:ITU-T Recommendation Q.780
983:ITU-T Recommendation Q.755
973:ITU-T Recommendation Q.752
943:ITU-T Recommendation Q.750
933:ITU-T Recommendation Q.710
923:ITU-T Recommendation Q.709
913:ITU-T Recommendation Q.708
903:ITU-T Recommendation Q.707
893:ITU-T Recommendation Q.706
883:ITU-T Recommendation Q.705
873:ITU-T Recommendation Q.704
863:ITU-T Recommendation Q.703
853:ITU-T Recommendation Q.702
843:ITU-T Recommendation Q.701
833:ITU-T Recommendation Q.700
717:SS No. 7 functional levels
713:ITU-T Recommendation Q.700
694:ITU-T Recommendation Q.701
528:ITU-T Recommendation Q.704
430:ITU-T Recommendation Q.703
388:ITU-T Recommendation Q.702
342:Network Service Part (NSP)
126:SS7 protocols by OSI layer
798:OSI layering and SS No. 7
766:OSI layering and SS No. 7
622:, described in RFC 4666.
496:, described in RFC 3331.
324:is sometimes abbreviated
204:
125:
782:Architecture of SS No. 7
601:Signaling Transfer Point
907:Testing and maintenance
610:) can be provided over
475:Link Status Signal Unit
456:described in RFC 4165.
55:"Message Transfer Part"
31:relies excessively on
827:ITU-T recommendations
239:(MTP) is part of the
237:Message Transfer Part
857:Signalling data link
392:Signalling Data Link
997:MTP Protocol Tester
815:, Figure 1/Q.1400,
530:, and provides the
479:Message Signal Unit
471:Fill-in Signal Unit
432:, and provides the
390:, and provides the
122:
1194:Signaling System 7
780:, Figure 2/Q.700,
748:, Figure 1/Q.711,
715:, Figure 3/Q.700,
680:, and, in the UK,
532:Signalling Network
316:, and Level 4 the
241:Signaling System 7
120:SS7 protocol suite
560:SSCOP or SSCOPMCE
304:Functional levels
233:
232:
116:
115:
108:
90:
1201:
820:
810:
801:
791:
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769:
759:
753:
743:
737:
726:
720:
710:
526:is described in
428:is described in
386:is described in
282:for MTP2 and in
278:recommendations
254:recommendations
225:
218:
211:
123:
111:
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100:
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48:
24:
16:
1209:
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1184:
1183:
1180:- SS7 Tutorial.
1175:
867:Signalling link
824:
823:
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804:
792:
788:
776:
772:
760:
756:
744:
740:
727:
723:
711:
707:
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647:
550:as provided by
521:
434:Signalling Link
423:
381:
306:
229:
148:
112:
101:
95:
92:
49:
47:
41:
37:primary sources
25:
12:
11:
5:
1207:
1205:
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1196:
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1182:
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1174:
1173:External links
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796:, Clause 2.2,
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182:Data link
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549:
546:described in
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541:
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303:
301:
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298:EN 300-0088-1
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88:
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78:
74:
71:
67:
64:
60:
57: –
56:
52:
51:Find sources:
45:
39:
38:
34:
29:This article
27:
23:
18:
17:
1166:
1156:
1145:
1134:
1116:
1106:
1096:
1086:
1076:
1066:
1056:
1046:
1036:
1026:
1016:
1006:
996:
986:
976:
966:
956:
946:
936:
926:
916:
906:
896:
886:
876:
866:
856:
846:
836:
816:
797:
789:
781:
773:
765:
764:, Clause 4,
757:
749:
741:
733:
729:
724:
716:
708:
689:
685:
665:
661:
653:
652:consists of
649:
648:
624:
605:
594:
575:
559:
551:
543:
539:
531:
523:
522:
498:
483:
467:signal units
466:
464:
459:
458:
445:
433:
425:
424:
408:
404:
391:
383:
382:
359:and part of
346:
341:
333:
329:
325:
321:
317:
313:
307:
288:
249:
236:
234:
198:
186:
170:
102:
93:
83:
76:
69:
62:
50:
30:
696:.775148760
686:MTP Level 4
576:MTP Level 3
540:MTP Level 3
524:MTP Level 3
460:MTP Level 2
426:MTP Level 2
384:MTP Level 1
330:MTP Level 2
322:MTP Level 3
199:MTP Level 1
187:MTP Level 2
171:MTP Level 3
132:Application
96:August 2012
700:References
597:Point Code
336:. MTP and
66:newspapers
33:references
1161:RFC
1151:RFC
1140:RFC
1129:RFC
1124:IETF RFCs
662:MTP Users
654:MTP Users
645:MTP Users
618:protocol
492:protocol
452:protocol
415:T-carrier
411:E-carrier
369:OSI model
365:OSI model
349:OSI model
1188:Category
572:Q.2150.3
564:Q.2150.2
556:Q.2150.1
477:(LSSU),
473:(FISU),
353:layers 1
318:MTP user
194:Physical
819:, p. 5.
800:, p. 4.
784:, p. 7.
768:, p. 9.
752:, p. 2.
719:, p. 8.
688:by the
666:Level 4
650:Level 4
631:Q.755.1
616:SIGTRAN
614:by the
583:SIGTRAN
505:Q.755.1
490:SIGTRAN
488:by the
481:(MSU).
450:SIGTRAN
363:in the
361:layer 3
166:Network
80:scholar
592:mode.
442:Q.2210
400:Q.2111
82:
75:
68:
61:
53:
639:Q.782
635:Q.780
627:Q.755
608:Q.701
566:) or
552:MTP3b
513:Q.781
509:Q.780
501:Q.755
446:MTP3b
284:Q.782
280:Q.781
276:ITU-T
272:Q.705
268:Q.704
264:Q.703
260:Q.702
256:Q.701
252:ITU-T
160:, ...
145:IS-41
87:JSTOR
73:books
1163:4666
1153:3331
1142:4165
1131:2719
734:MTP3
732:and
730:MTP2
674:ISUP
670:SCCP
668:are
637:and
620:M3UA
612:SCTP
590:IPSP
586:M3UA
580:IETF
568:SCTP
511:and
494:M2UA
486:SCTP
454:M2PA
440:and
373:SCCP
338:SCCP
334:MTP2
326:MTP3
308:The
295:ETSI
291:ANSI
270:and
235:The
175:SCCP
158:ISUP
150:TCAP
137:INAP
59:news
690:MTP
682:IUP
678:TUP
658:SS7
574:).
558:),
413:or
398:or
314:MTP
310:SS7
154:CAP
147:...
141:MAP
35:to
1190::
1165:,
1155:,
1144:,
1133:,
1115:,
1105:,
1095:,
1085:,
1075:,
1065:,
1055:,
1045:,
1035:,
1025:,
1015:,
1005:,
995:,
985:,
975:,
965:,
955:,
945:,
935:,
925:,
915:,
905:,
895:,
885:,
875:,
865:,
855:,
845:,
835:,
805:^
676:,
672:,
641:.
633:,
629:,
515:.
507:,
503:,
355:,
344:.
332:,
328:;
320:.
300:.
266:,
262:,
258:,
173:+
156:,
152:,
143:,
139:,
46:.
1148:.
1137:.
1119:.
1109:.
1099:.
1089:.
1079:.
1069:.
1059:.
1049:.
1039:.
1029:.
1019:.
1009:.
999:.
989:.
979:.
969:.
959:.
949:.
939:.
929:.
919:.
909:.
899:.
889:.
879:.
869:.
859:.
849:.
839:.
736:.
570:(
562:(
554:(
357:2
224:e
217:t
210:v
109:)
103:(
98:)
94:(
84:·
77:·
70:·
63:·
40:.
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