| Abstract
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Public Switched Telephone Network (PSTN) services such as 800 number
routing (freephone), time-and-day routing, credit-card calling,
virtual private network (mapping a private network number into a
public number) are realized by the Intelligent Network (IN). This
draft addresses means to support existing IN services from Session
Initiation Protocol (SIP) endpoints for an IP-host-to-phone call.
The call request is originated on a SIP endpoint, but the services to
the call are provided by the data and procedures resident in the
PSTN/IN. To provide IN services in a transparent manner to SIP
endpoints, this draft describes the mechanism for interworking SIP
and Intelligent Network Application Part (INAP).
Table of Contents
1 INTRODUCTION.................................................. 3
2 ACCESS TO IN-SERVICES FROM A SIP ENTITY....................... 4
3 ADDITIONAL SIN CONSIDERATIONS................................. 7
3.1 The concept of state in SIP.............................. 7
3.2 Relationship between SCP and a SIN-enabled SIP entity.... 8
3.3 SIP REGISTER and IN services............................. 8
3.4 Support of announcements and mid-call signaling.......... 8
4 THE SIN ARCHITECTURE.......................................... 9
4.1 Definitions.............................................. 9
4.2 IN Service control based on the SIN approach.............10
5 MAPPING OF THE SIP STATE MACHINE TO THE IN STATE MODEL........11
5.1 Mapping SIP protocol state machine to O_BCSM.............12
5.2 Mapping SIP protocol state machine to T_BCSM.............17
6 EXAMPLE CALL FLOWS............................................22
7 SECURITY CONSIDERATIONS.......................................23
Appendix A.......................................................23
Normative References.............................................24
Informative References...........................................24
Acknowledgments..................................................25
Changes from previous drafts.....................................25
Author's addresses...............................................26
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