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Network Working Group K. Morneault, Ed.

Request for Comments: 4666 Cisco Systems

Obsoletes: 3332 J. Pastor-Balbas, Ed.

Category: Standards Track Ericsson

September 2006

Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) -

User Adaptation Layer (M3UA)

Status of This Memo

This document specifies an Internet standards track protocol for the

Internet community, and requests discussion and suggestions for

improvements. Please refer to the current edition of the "Internet

Official Protocol Standards" (STD 1) for the standardization state

and status of this protocol. Distribution of this memo is unlimited.

Abstract

This memo defines a protocol for supporting the transport of any SS7

MTP3-User signalling (e.g., ISUP and SCCP messages) over IP using the

services of the Stream Control Transmission Protocol. Also,

provision is made for protocol elements that enable a seamless

operation of the MTP3-User peers in the SS7 and IP domains. This

protocol would be used between a Signalling Gateway (SG) and a Media

Gateway Controller (MGC) or IP-resident Database, or between two IP-

based applications. It is assumed that the SG receives SS7

signalling over a standard SS7 interface using the SS7 Message

Transfer Part (MTP) to provide transport. This document obsoletes

RFC 3332.

Morneault & Pastor-Balbas Standards Track [Page 1]

RFC 4666 SS7 MTP3-User Adaptation Layer September 2006

Table of Contents

1. Introduction ....................................................6

1.1. Scope ......................................................6

1.2. Terminology ................................................6

1.3. M3UA Overview ..............................................9

1.3.1. Protocol Architecture ...............................9

1.3.2. Services Provided by the M3UA Layer ................10

1.3.2.1. Support for the Transport of

MTP3-User Messages ........................10

1.3.2.2. Native Management Functions ...............11

1.3.2.3. Interworking with MTP3 Network

Management Functions ......................11

1.3.2.4. Support for the Management of SCTP

Associations between the ..................11

1.3.2.5. Support for the Management of

Connections to Multiple SGPs ..............12

1.4. Functional Areas ..........................................12

1.4.1. Signalling Point Code Representation ...............12

1.4.2. Routing Contexts and Routing Keys ..................14

1.4.2.1. Overview ..................................14

1.4.2.2. Routing Key Limitations ...................15

1.4.2.3. Managing Routing Contexts and

Routing Keys ..............................15

1.4.2.4. Message Distribution at the SGP ...........15

1.4.2.5. Message Distribution at the ASP ...........16

1.4.3. SS7 and M3UA Interworking ..........................16

1.4.3.1. Signalling Gateway SS7 Layers .............16

1.4.3.2. SS7 and M3UA Interworking at the SG .......17

1.4.3.3. Application Server ........................17

1.4.3.4. IPSP Considerations .......................18

1.4.4. Redundancy Models ..................................18

1.4.4.1. Application Server Redundancy .............18

1.4.5. Flow Control .......................................18

1.4.6. Congestion Management ..............................19

1.4.7. SCTP Stream Mapping ................................19

1.4.8. SCTP Client/Server Model ...........................19

1.5. Sample Configuration ......................................20

1.5.1. Example 1: ISUP Message Transport ..................20

1.5.2. Example 2: SCCP Transport between IPSPs ............21

1.5.3. Example 3: SGP Resident SCCP Layer, with

Remote ASP .........................................22

1.6. Definition of M3UA Boundaries .............................23

1.6.1. Definition of the Boundary between M3UA and

an MTP3-User .......................................23

1.6.2. Definition of the Boundary between M3UA and SCTP ...23

1.6.3. Definition of the Boundary between M3UA and

Layer Management ...................................24

Morneault & Pastor-Balbas Standards Track [Page 2]

RFC 4666 SS7 MTP3-User Adaptation Layer September 2006

2. Conventions ....................................................27

3. M3UA Protocol Elements .........................................28

3.1. Common Message Header .....................................28

3.1.1. M3UA Protocol Version: 8 bits (unsigned integer) ...28

3.1.2. Message Classes and Types ..........................28

3.1.3. Reserved: 8 Bits ...................................30

3.1.4. Message Length: 32-Bits (Unsigned Integer) .........30

3.2. Variable-Length Parameter Format ..........................30

3.3. Transfer Messages .........................................33

3.3.1. Payload Data Message (DATA) ........................33

3.4. SS7 Signalling Network Management (SSNM) Messages .........36

3.4.1. Destination Unavailable (DUNA) .....................36

3.4.2. Destination Available (DAVA) .......................39

3.4.3. Destination State Audit (DAUD) .....................40

3.4.4. Signalling Congestion (SCON) .......................40

3.4.5. Destination User Part Unavailable (DUPU) ...........43

3.4.6. Destination Restricted (DRST) ......................45

3.5. ASP State Maintenance (ASPSM) Messages ....................45

3.5.1. ASP Up .............................................45

3.5.2. ASP Up Acknowledgement (ASP Up Ack) ................46

3.5.3. ASP Down ...........................................47

3.5.4. ASP Down Acknowledgement (ASP Down Ack) ............48

3.5.5. Heartbeat (BEAT) ...................................48

3.5.6. Heartbeat Acknowledgement (BEAT Ack) ...............49

3.6. Routing Key Management (RKM) Messages [Optional] ..........49

3.6.1. Registration Request (REG REQ) .....................49

3.6.2. Registration Response (REG RSP) ....................54

3.6.3. Deregistration Request (DEREG REQ) .................56

3.6.4. Deregistration Response (DEREG RSP) ................57

3.7. ASP Traffic Maintenance (ASPTM) Messages ..................59

3.7.1. ASP Active .........................................59

3.7.2. ASP Active Acknowledgement (ASP Active Ack) ........60

3.7.3. ASP Inactive .......................................61

3.7.4. ASP Inactive Acknowledgement (ASP Inactive Ack) ....62

3.8. Management (MGMT) Messages ................................63

3.8.1. Error ..............................................63

3.8.2. Notify .............................................67

4. Procedures .....................................................70

4.1. Procedures to Support the M3UA-User .......................70

4.1.1. Receipt of Primitives from the M3UA-User ...........70

4.2. Receipt of Primitives from the Layer Management ...........71

4.2.1. Receipt of M3UA Peer Management Messages ...........72

4.3. AS and ASP/IPSP State Maintenance .........................73

4.3.1. ASP/IPSP States ....................................74

4.3.2. AS States ..........................................76

4.3.3. M3UA Management Procedures for Primitives ..........78

4.3.4. ASPM Procedures for Peer-to-Peer Messages ..........79

4.3.4.1. ASP Up Procedures .........................79

Morneault & Pastor-Balbas Standards Track [Page 3]

RFC 4666 SS7 MTP3-User Adaptation Layer September 2006

4.3.4.2. ASP-Down Procedures .......................81

4.3.4.3. ASP Active Procedures .....................82

4.3.4.4. ASP Inactive Procedures ...................86

4.3.4.5. Notify Procedures .........................88

4.3.4.6. Heartbeat Procedures ......................89

4.4. Routing Key Management Procedures [Optional] ..............90

4.4.1. Registration .......................................90

4.4.2. Deregistration .....................................92

4.4.3. IPSP Considerations (REG/DEREG) ....................93

4.5. Procedures to Support the Availability or

Congestion Status of SS7 Destination ......................93

4.5.1. At an SGP ..........................................93

4.5.2. At an ASP ..........................................94

4.5.2.1. Single SG Configurations ..................94

4.5.2.2. Multiple SG Configurations ................94

4.5.3. ASP Auditing .......................................94

4.6. MTP3 Restart ..............................................96

4.7. NIF Not Available .........................................97

4.8. M3UA Version Control ......................................97

4.9. M3UA Termination ..........................................97

5. Examples of M3UA Procedures ....................................98

5.1. Establishment of Association and Traffic between

SGPs and ASPs .............................................98

5.1.1. Single ASP in an Application Server ("1+0"

sparing), No Registration ..........................98

5.1.1.1. Single ASP in an Application

Server ("1+0" Sparing), No Registration ...98

5.1.1.2. Single ASP in Application Server

("1+0" Sparing), Dynamic Registration .....99

5.1.1.3. Single ASP in Multiple

Application Servers (Each with "1+0"

Sparing), Dynamic Registration (Case 1

- Multiple Registration Requests) ........100

5.1.1.4. Single ASP in Multiple

Application Servers (each with "1+0"

sparing), Dynamic Registration (Case 2

- Single Registration Request) ...........101

5.1.2. Two ASPs in Application Server ("1+1" Sparing) ....102

5.1.3. Two ASPs in an Application Server ("1+1"

Sparing, Loadsharing Case) ........................103

5.1.4. Three ASPs in an Application Server ("n+k"

Sparing, Loadsharing Case) ........................104

5.2. ASP Traffic Failover Examples ............................105

5.2.1. 1+1 Sparing, Withdrawal of ASP, Backup Override ...105

5.2.2. 1+1 Sparing, Backup Override ......................105

5.2.3. n+k Sparing, Loadsharing Case, Withdrawal of ASP ..106

5.3. Normal Withdrawal of an ASP from an Application Server ...106

5.4. Auditing Examples ........................................107

Morneault & Pastor-Balbas Standards Track [Page 4]

RFC 4666 SS7 MTP3-User Adaptation Layer September 2006

5.4.1. SG State: Uncongested/Available ...................107

5.4.2. SG State: Congested (Congestion Level=2) /

Available .........................................107

5.4.3. SG State: Unknown/Available .......................107

5.4.4. SG State: Unavailable .............................108

5.5. M3UA/MTP3-User Boundary Examples .........................108

5.5.1. At an ASP .........................................108

5.5.1.1. Support for MTP-TRANSFER

Primitives at the ASP ....................108

5.5.2. At an SGP .........................................109

5.5.2.1. Support for MTP-TRANSFER Request

Primitive at the SGP .....................109

5.5.2.2. Support for MTP-TRANSFER

Indication Primitive at the SGP ..........110

5.5.2.3. Support for MTP-PAUSE,

MTP-RESUME, MTP-STATUS Indication

Primitives ...............................110

5.6. Examples for IPSP Communication ..........................112

5.6.1. Single Exchange ...................................112

5.6.2. Double Exchange ...................................113

6. Security Considerations .......................................113

7. IANA Considerations ...........................................114

7.1. SCTP Payload Protocol Identifier .........................114

7.2. M3UA Port Number .........................................114

7.3. M3UA Protocol Extensions .................................114

7.3.1. IETF-Defined Message Classes ......................115

7.3.2. IETF Defined Message Types ........................115

7.3.3. IETF-Defined Parameter Extension ..................115

8. Acknowledgements ..............................................115

9. Document Contributors .........................................116

10. References ...................................................116

10.1. Normative References ....................................116

10.2. Informative References ..................................117

Appendix A .......................................................119

A.1. Signalling Network Architecture .............................119

A.2. Redundancy Models ...........................................121

A.2.1. Application Server Redundancy ........................121

A.2.2. Signalling Gateway Redundancy ........................122

Morneault & Pastor-Balbas Standards Track [Page 5]

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