rfc7549v2.txt   rfc7549.txt 
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Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 5 2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. Applicability . . . . . . . . . . . . . . . . . . . . . . . . 5 3. Applicability . . . . . . . . . . . . . . . . . . . . . . . . 6
4. Traffic Leg Examples . . . . . . . . . . . . . . . . . . . . 5 4. Traffic Leg Examples . . . . . . . . . . . . . . . . . . . . 6
4.1. General . . . . . . . . . . . . . . . . . . . . . . . . . 5 4.1. General . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2. Originating Roaming Call . . . . . . . . . . . . . . . . 5 4.2. Originating Roaming Call . . . . . . . . . . . . . . . . 6
4.3. Terminating Roaming Call . . . . . . . . . . . . . . . . 5 4.3. Terminating Roaming Call . . . . . . . . . . . . . . . . 7
4.4. Call from Originating Home to Terminating Home . . . . . 6 4.4. Call from Originating Home to Terminating Home . . . . . 7
5. 'iotl' SIP URI Parameter . . . . . . . . . . . . . . . . . . 6 5. 'iotl' SIP URI Parameter . . . . . . . . . . . . . . . . . . 7
5.1. Usage . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5.1. Usage . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.2. Parameter Values . . . . . . . . . . . . . . . . . . . . 7 5.2. Parameter Values . . . . . . . . . . . . . . . . . . . . 8
5.2.1. General . . . . . . . . . . . . . . . . . . . . . . . 7 5.2.1. General . . . . . . . . . . . . . . . . . . . . . . . 8
5.2.2. homea-homeb . . . . . . . . . . . . . . . . . . . . . 7 5.2.2. homea-homeb . . . . . . . . . . . . . . . . . . . . . 8
5.2.3. homeb-visitedb . . . . . . . . . . . . . . . . . . . 7 5.2.3. homeb-visitedb . . . . . . . . . . . . . . . . . . . 8
5.2.4. visiteda-homea . . . . . . . . . . . . . . . . . . . 8 5.2.4. visiteda-homea . . . . . . . . . . . . . . . . . . . 9
5.2.5. homea-visiteda . . . . . . . . . . . . . . . . . . . 8 5.2.5. homea-visiteda . . . . . . . . . . . . . . . . . . . 9
5.2.6. visiteda-homeb . . . . . . . . . . . . . . . . . . . 8 5.2.6. visiteda-homeb . . . . . . . . . . . . . . . . . . . 9
6. Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6. Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.1. General . . . . . . . . . . . . . . . . . . . . . . . . . 9 6.1. General . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.2. ABNF . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6.2. ABNF . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7. Security Considerations . . . . . . . . . . . . . . . . . . . 9 7. Security Considerations . . . . . . . . . . . . . . . . . . . 10
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 10 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
9.1. Normative References . . . . . . . . . . . . . . . . . . 10 9.1. Normative References . . . . . . . . . . . . . . . . . . 11
9.2. Informative References . . . . . . . . . . . . . . . . . 10 9.2. Informative References . . . . . . . . . . . . . . . . . 11
Appendix A. 3GPP Examples . . . . . . . . . . . . . . . . . . . 11 Appendix A. 3GPP Examples . . . . . . . . . . . . . . . . . . . 12
A.1. General . . . . . . . . . . . . . . . . . . . . . . . . . 11 A.1. General . . . . . . . . . . . . . . . . . . . . . . . . . 12
A.2. The UE Registers via P-CSCF . . . . . . . . . . . . . . . 11 A.2. The UE Registers via P-CSCF . . . . . . . . . . . . . . . 12
A.3. Originating IMS Call . . . . . . . . . . . . . . . . . . 12 A.3. Originating IMS Call . . . . . . . . . . . . . . . . . . 14
A.4. Terminating IMS Call . . . . . . . . . . . . . . . . . . 13 A.4. Terminating IMS Call . . . . . . . . . . . . . . . . . . 15
A.5. Call between Originating Home and Terminating Home A.5. Call between Originating Home and Terminating Home
Network . . . . . . . . . . . . . . . . . . . . . . . . . 14 Network . . . . . . . . . . . . . . . . . . . . . . . . . 16
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 15 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 17
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 17
1. Introduction 1. Introduction
In a 3GPP network, an end-user device can be attached (e.g., using a In a 3GPP network, an end-user device can be attached (e.g., using a
radio access network) to its own operator network (home network) radio access network) to its own operator network (home network)
[TS.3GPP.24.229] or to another operator's network (visited network) [TS.3GPP.24.229] or to another operator's network (visited network)
[TS.3GPP.24.229]. In the latter case, the user is referred to as a [TS.3GPP.24.229]. In the latter case, the user is referred to as a
roaming user. roaming user.
3GPP operator networks are often not connected directly to each 3GPP operator networks are often not connected directly to each
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Parameter Name Predefined Values Reference Parameter Name Predefined Values Reference
____________________________________________ ____________________________________________
iotl Yes RFC 7549 iotl Yes RFC 7549
9. References 9. References
9.1. Normative References 9.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997, Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>. <http://www.rfc-editor.org/info/rfc2119>.
[RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, [RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,
A., Peterson, J., Sparks, R., Handley, M., and E. A., Peterson, J., Sparks, R., Handley, M., and E.
Schooler, "SIP: Session Initiation Protocol", RFC 3261, Schooler, "SIP: Session Initiation Protocol", RFC 3261,
June 2002, <http://www.rfc-editor.org/info/rfc3261>. DOI 10.17487/RFC3261, June 2002,
<http://www.rfc-editor.org/info/rfc3261>.
[RFC3327] Willis, D. and B. Hoeneisen, "Session Initiation Protocol [RFC3327] Willis, D. and B. Hoeneisen, "Session Initiation Protocol
(SIP) Extension Header Field for Registering Non-Adjacent (SIP) Extension Header Field for Registering Non-Adjacent
Contacts", RFC 3327, December 2002, Contacts", RFC 3327, DOI 10.17487/RFC3327, December 2002,
<http://www.rfc-editor.org/info/rfc3327>. <http://www.rfc-editor.org/info/rfc3327>.
[RFC3608] Willis, D. and B. Hoeneisen, "Session Initiation Protocol [RFC3608] Willis, D. and B. Hoeneisen, "Session Initiation Protocol
(SIP) Extension Header Field for Service Route Discovery (SIP) Extension Header Field for Service Route Discovery
During Registration", RFC 3608, October 2003, During Registration", RFC 3608, DOI 10.17487/RFC3608,
<http://www.rfc-editor.org/info/rfc3608>. October 2003, <http://www.rfc-editor.org/info/rfc3608>.
[RFC3969] Camarillo, G., "The Internet Assigned Number Authority [RFC3969] Camarillo, G., "The Internet Assigned Number Authority
(IANA) Uniform Resource Identifier (URI) Parameter (IANA) Uniform Resource Identifier (URI) Parameter
Registry for the Session Initiation Protocol (SIP)", BCP Registry for the Session Initiation Protocol (SIP)", BCP
99, RFC 3969, December 2004, 99, RFC 3969, DOI 10.17487/RFC3969, December 2004,
<http://www.rfc-editor.org/info/rfc3969>. <http://www.rfc-editor.org/info/rfc3969>.
[RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax [RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234, January 2008, Specifications: ABNF", STD 68, RFC 5234,
DOI 10.17487/RFC5234, January 2008,
<http://www.rfc-editor.org/info/rfc5234>. <http://www.rfc-editor.org/info/rfc5234>.
[TS.3GPP.24.229] [TS.3GPP.24.229]
3GPP, "Vocabulary for 3GPP Specifications", 3GPP TS 24.229 3GPP, "Vocabulary for 3GPP Specifications", 3GPP TS 24.229
12.6.0, September 2014. 12.6.0, September 2014.
9.2. Informative References 9.2. Informative References
[RFC3325] Jennings, C., Peterson, J., and M. Watson, "Private [RFC3325] Jennings, C., Peterson, J., and M. Watson, "Private
Extensions to the Session Initiation Protocol (SIP) for Extensions to the Session Initiation Protocol (SIP) for
Asserted Identity within Trusted Networks", RFC 3325, Asserted Identity within Trusted Networks", RFC 3325,
November 2002, <http://www.rfc-editor.org/info/rfc3325>. DOI 10.17487/RFC3325, November 2002,
<http://www.rfc-editor.org/info/rfc3325>.
Appendix A. 3GPP Examples Appendix A. 3GPP Examples
A.1. General A.1. General
This section contains example call flows based on 3GPP usage of the This section contains example call flows based on 3GPP usage of the
SIP URI 'iotl' parameter. SIP URI 'iotl' parameter.
A.2. The UE Registers via P-CSCF A.2. The UE Registers via P-CSCF
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