1、ETSI TS 1 O1 482-1 1.1.1 (1999-12) Technical Specification Integrated Services Digital Network (ISDN); DSSI based protocol for call control 81 resource management over a TCP/IP network; Part 1 : Protocol specification 2 ETSI TS 1 O1 482-1 V1.l.l (1 999-1 2) Reference DTS/SPAN-05208-1 Keywords IP, IS
2、DN, DSSI, protocol ETSI Postal address F-O6921 Sophia Antipolis Cedex - FRANCE Office address 650 Route des Lucioles - Sophia Antipolis Valbonne - FRANCE Siret No 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) No 7803/88 Tel.: +33 4 92 94 42 O0
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5、rive within ETSI Secretariat. Cor vriaht Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute 1999. All rights reserved. ETSI 3 ETSI TS 1 O
6、1 482-1 V1.l.l (1 999-1 2) Contents Intellectual Property Rights 5 Foreword 5 1 Scope 6 2 References 6 3 Definitions 7 4 Abbreviations . 7 5 Description . 7 6 Operational Requirements 8 7 Coding requirements 8 7.1 Messages 8 7.1.1 LOGON 8 7.1.2 LOGON ACKNOWLEDGE . 9 7.1.4 RESOURCE REGISTRATION ACKNO
7、WLEDGE 10 7.1.5 SERVICE 10 7.1.6 SERVICE ACKNOWLEDGE 10 7.2 Information elements 11 7.2.1 Channel status . 11 7.2.2 Continuity Indicator 12 7.2.3 Resource . 12 8 State Definitions . 13 8.1. States at the NAS side of the interface . 13 8.2. States at the MGC side of the interface 13 9 Call related si
8、gnalling procedures 14 10 Resource related signalling procedures 14 10.1 Logon procedure 14 10.1.1 Normal procedure . 14 7.1.3 RESOURCE REGISTRATION 9 10.1.2 Exceptional procedure 14 10.2 Resource registration 14 10.2.2 Exceptional procedure 15 10.3 Service procedure . 15 10.3.2 Exceptional procedur
9、e 15 Parameter values (timers) . 16 Media Gateway (MGC) interworking with SS7 network 21 Interworking from ISUP to DSS1 based protocol for call control and resource management over a TCP/IP network 21 IAM message received with continuity check required 21 Continuity Check Request received 22 10.2.1
10、Normal procedure . 14 10.3.1 Normal procedure . 15 1 1 12 Dynamic description (SDL diagrams) 16 Annex A (normative): A.l A.l. 1 A.1.2 ETSI 4 ETSI TS 1 O1 482-1 V1.l.l (1 999-1 2) A.2 Interworking from DSS 1 based protocol for call control and resource management over a TCP/IP network to ISUP . 22 An
11、nex B (informative): Message sequence charts. typical examples 23 B.l Continuity test successful (initiated with IAM) . 23 B . 2 Unsuccessful continuity test (initiated with IAM) . 24 B.3 Continuity test successful (initiated with CCR) . 24 B.4 Unsuccessful continuity test (initiated with CCR) . 25
12、History 26 ETSI 5 ETSI TS 1 O1 482-1 V1.l.l (1 999-1 2) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and
13、 can be found in SR O00 3 14: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/www.etsi.org/ipr). Pursuant to the ET
14、SI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in SR O00 3 14 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword Th
15、is Technical Specification (TS) has been produced by ETSI Technical Committee Services and Protocols for Advanced Networks (SPAN). The present document is part 1 of a multi-part TS covering Integrated Services Digital Network (ISDN); DSS 1 based protocol for call control Part 2: “PICS proforma“; Par
16、t 3: “Test Suite Structure and test Purposes (TSS Part 4: “Abstract Test Suite (ATS) and partial Protocol Implementation extra Information for Testing (PIXIT) proforma specification for the user“; “Test Suite Structure and test Purposes (TSS “Abstract test Suite (ATS) and partial Protocol Implementa
17、tion extra Information for Testing (PIXIT) proforma specification for the network“. Part 5: Part 6: ETSI 6 ETSI TS 1 O1 482-1 V1.l.l (1 999-1 2) 1 Scope The present document describes the DSS 1 based protocol for call control and resource management over an Internet Protocol (IP) based network to a
18、Network Access Server (NAS). The protocol runs between a NAS and a Media Gateway Controller (MGC) as defined by the N reference point in ETSI TIPHON TS 101 313 i. The scope of application of the protocol excludes Voice over IP (VoIP), Fax over IP (FoIP) or anything else which is not strictly interne
19、t dial-up access. The protocol uses infull (DSS 1) with additional messages and information elements. The transport mechanism for the IP based messages is outside the scope of the present document. The protocol uses all standard DSS 1 procedures with the consideration that the network entity is the
20、Media Gateway Controller (MGC) and the user entity is the NAS. The present document only specifies those procedures that have been added to fit the architectural requirements. The present document applies to narrowband bearer services in the Switched Circuit Network (SCN) used for modem and ISDN cal
21、ls to NASS. NOTE: Dial out access is for further study. 2 Ref e ren ces The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication, edition number, version number,
22、etc.) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same number. 111 TS 101 3 13: “Telecommunication
23、s and Internet Protocol Harmonization Over Networks (TIPHON); Network architecture and reference configurations; Phase II: Scenario 1 + Scenario 2“. ITU-T Recommendation I. 112 (03/93): “Vocabulary of terms for ISDNs“. EN 300 403- 1: “Integrated Services Digital Network (ISDN); Digital Subscriber Si
24、gnalling System No. one (DSS 1) protocol; Signalling network layer for circuit-mode basic call control; Part 1: Protocol specification ITU-T Recommendation 4.93 1 (1993), modified“. ITU-T Recommendation 4.699: “Interworking between ISDN access and non-ISDN access over ISDN User Part of Signalling Sy
25、stem No. 7“. EN 300 899- 1: “Integrated Services Digital Network (ISDN); Signalling System No.7; Interworking between ISDN User Part (ISUP) version 2 and Digital Subscriber Signalling System No. one (DSS 1); Part 1: Protocol specification ITU-T Recommendation 4.699, modified“. ITU-T Recommendation 4
26、.93 1: “SDN user-network interface layer 3 specification for basic call control“. 121 131 141 151 161 ETSI 7 ETSI TS 1 O1 482-1 V1.l.l (1 999-1 2) i i 3 Def i nit ions For the purposes of the present document, the following terms and definitions apply: Integrated Services Digital Network (ISDN): see
27、 ITU-T Recommendation I. 112 2, subclause 2.3, definition 308. Media Gateway Controller: see TS 101 313 i, subclause 3.1. Network the DSS 1 protocol entity at the network side of the user-network interface. Network Access Server: the device that acts as a Media Gateway (see TS 101 313 i, subclause 3
28、.1). Media GW J Signalling i E.b Controller GW i 4 Media GW Abbreviations E.a For the purpose of the present document, the following abbreviations apply: DSS 1 ISDN IP MGC NAS SCN SGW ss7 Digital Subscribe Signalling System Number 1 Integrated Services Digital Network Internet Protocol Media Gateway
29、 Controller Network Access Server Switched Circuit Network Signalling Gateway Signalling System No. 7 5 Description This protocol is used at the N reference point defered in TS 101 313 i as shown in figure 1. The TIPHON architecture is functional rather than physical. However the NAS is a physical m
30、edia gateway. The MGC could be a function of a combined Signalling Gateway (SGW)MGC Controller or it could be a standalone device. NOTE 1 : The E.a reference point is between the gateway (Media Gateway) and the SCN. The E.b reference point is between the gateway (Signalling Gateway) and the SCN. The
31、 J reference point is between the SGW and the MGC. NOTE 2: The transport mechanism for the IP based messages is outside the scope of the present document. This transport mechanism shall be reliable and shall support redundant paths. NOTE 3: Dial out access is for further study. Figure 1: TS 101 313
32、l functional architecture ETSI 8 ETSI TS 1 O1 482-1 V1.l.l (1 999-1 2) Information element Protocol discriminator Call reference Message type 6 Operational Requirements Reference Direction Type Length (subclause) 4.2/Q.931 6 NAS + MGC M 1 43Q.931 6 NAS + MGC M (note) 2-* 4.4Q.931 6 NAS + MGC M 1 The
33、 primary requirement is call control as per EN 300 403-1 3 over an IP based network. Additionally, the MGC needs to be made aware of the state of the resources in the NAS. The continuity test procedure for incoming calls shall be supported. 7 7.1 Coding requirements Messages This subclause defines t
34、he messages the MGC and NAS use for call processing, maintenance and management. These messages are based on the “DSS 1“ message set, and in most cases are simply specific codings of standard DSS 1 messages. However, because the requirements of the MGC based systems differ from those of ISDN access
35、for which the DSS 1 message set was developed, some messages described in this subclause are extensions of standard DSS 1 messages. Table 1 lists the extended Control Protocol message set. The Protocol Discriminator used for new all messages is O x 4A. Table 1 : Control Protocol message set Message
36、Value LOGON 0x1 o LOGON ACKNOWLEDGE 0x1 1 RESOURCE REGISTRATION 0x38 RESOURCE REGISTRATION 0x39 ACKNOWLEDGE SERVICE Ox3A SERVICE ACKNOWLEDGE Ox3B The LOGON and LOGON ACKNOWLEDGE messages use a global call reference. The RESOURCE REGISTRATION, RESOURCE REGISTRATION ACKNOWLEDGE, SERVICE and SERVICE AC
37、KNOWLEDGE messages use a unique call reference. NOTE: Even though some messages use a unique call reference, these messages are not call related. These messages have to be uniquely identified and the call reference is the best mechanism in DSS 1 to guarantee the uniqueness of the message. 7.1 .I LOG
38、ON This message is sent by the NAS to the MGC to indicate a cold restart or a link level reset. See table 2. ETSI 9 Information element Protocol discriminator Call reference Message type ETSI TS 1 O1 482-1 V1.l.l (1 999-1 2) Reference Direction Type Length (subclause) 4.2/Q.931 6 MGC + NAS M 1 43Q.9
39、31 6 MGC + NAS M (note) 2-* 4.4Q.931 6 MGC + NAS M 1 7.1.2 LOGON ACKNOWLEDGE Information element Protocol discriminator Call reference This message is sent to acknowledge the receipt of the LOGON message and to indicate that the requested logon is completed. See table 3. Reference Direction Type Len
40、gth (subclause) 4.2/Q.931 6 NAS + MGC M 1 43Q.931 6 NAS + MGC M (note 1) 2-* Table 3: LOGON ACKNOWLEDGE message content Message type Resource Channel identification 4.4Q.931 6 NAS + MGC M 1 7.2.1 NAS + MGC M (note 2) 3-5 4.5.13/Q.931 6 NAS + MGC O (note 3) 2-* 1 7.1.3 RESOURCE REGISTRATION This mess
41、age is sent by the NAS to register associated trunk (El interfaces) and user port resources. See table 4. Table 4: RESOURCE REGISTRATION message content IJ I I I Call state 14.5.7/Q.931 6 I NAS + MGC I O (note 4) 13 NOTE 1 : This message is sent with a unique call reference defined in 4.3/Q.931 6. N
42、OTE 2: When an entire EI trunk interface or a host resource is specified, the status (octet 3) may be coded as available or unavailable. When one or more channels of an EI trunk interface are specified, the status shall be coded as available if the Call state information element is included and the
43、status shall be coded as unavailable if the Call state information element is not included. NOTE 3: Included when necessary to identify a trunk resource. May be repeated to identify multiple trunk interfaces. NOTE 4: Included when one (or more) channels of a trunk resource are identified. Omitted in
44、 other cases. Applies for all channels identified in the Channel identification information element. ETSI 10 ETSI TS 1 O1 482-1 V1.l.l (1 999-1 2) Information element Protocol discriminator Call reference Message type 7.1.4 RESOURCE REGISTRATION ACKNOWLEDGE Reference Direction Type Length (subclause
45、) 4.2/Q.931 6 MGC + NAS M 1 43Q.931 6 MGC + NAS M (note) 2-* 4.4Q.931 6 MGC + NAS M 1 This message is sent by the MGC to acknowledge the registration of associated trunk (El interfaces) and user port resources. See table 5. Information element Protocol discriminator Call reference Message type Chann
46、el identification Channel status Table 5: RESOURCE REGISTRATION ACKNOWLEDGE message content Message type: RESOURCE REGISTRATION ACKNOWLEDGE Significance: local Reference Direction Type Length (subclause) 4.2/Q.931 6 both M 1 4.3/Q.931 6 both M (note 1) 2-* 4.4/Q.931 6 both M 1 4.5.13/Q.931 6 both M
47、(note 2) 2-* 7.2.2 both M 3 1 Information element Protocol discriminator Call reference Message type Channel identification Channel status Continuity indicator 7.1.5 SERVICE Reference Direction Type Length (subclause) 4.2/Q.931 6 both M 1 4.3/Q.931 6 both M (note 1) 2-* 4.4/Q.931 6 both M 1 4.5.13/Q
48、.931 6 both M (note 2) 2-* 7.2.2 both M 3 7.2.3 NAS + MGC O (note 3) 3 1 This message is sent by the MGC to request a change of status for one or more channels and by the NAS to indicate a change of status for one or more channels. See table 6. Table 6: SERVICE message content 7.1.6 SERVICE ACKNOWLE
49、DGE This message is sent by the MGC or the NAS to acknowledge the change of status of one or more channels. See table 7. Table 7: SERVICE ACKNOWLEDGE message content ETSI 11 Information Element Channel Status Continuity Indicator Resource ETSI TS 1 O1 482-1 V1.l.l (1 999-1 2) IE Value 0x1 1 0x1 9 0x1 A 7.2 Information elements O O O 1 O O O 1 1 Device Status Length This subclause describes the information elements that are the building blocks of the MGC Control Protocol messages. These information elements are based on
