Diameter in the IMS The 3GPP standards body has adopted Diameter as the primary signaling protocol for AAA and mobility management in the IP Multimedia Subsystem (IMS). The IMS is the service delivery environment for real-time multimedia services for the 3rd Generation wireless network and is also an ideal architecture for service convergence across fixed, wireless, and corporate enterprise networks. IMS offers a secure, mediated access to value-added services and network resources inside a managed core IP network while providing open interfaces for third party developers and enterprise-based applications that need access to the trusted carrier.
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Security Considerations with Diameter This memo does not describe a stand-alone protocol, but a particular
application for the Diameter protocol [RFC3588]. Consequently, all
the security considerations applicable to Diameter automatically
apply to this memo. In particular, Section 13 of RFC 3588 applies to
this memo.
This Diameter SIP application allows a Diameter client to use the
properties of HTTP Digest authentication [RFC2617] by evaluating or
sending to the Diameter server the credentials supplied by a user.
The discussion of HTTP Digest authentication in Section 4 of RFC 2617
[RFC2617] is also applicable to this memo. |
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Migration from RADIUS to DIAMETER RADIUS offers support for HTTP Digest authentication in the RADIUS
Extension for Digest Authentication [RFC4590]. A number of AVPs (the
Digest-* AVPs) of this Diameter SIP application are imported from the
RADIUS attributes namespace, thus making the migration from RADIUS to
Diameter smooth.
Note that the RADIUS Extension for Digest Authentication [RFC4590]
provides a more limited scope than this Diameter SIP application.
Specifically, the RADIUS extension for Digest Authentication merely
provides support for HTTP Digest authentication, whereas the Diameter
SIP application provides support for user location, profile
downloading and update, etc.
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Diameter SIP Application AVPs This section defines new AVPs used in this Diameter SIP application.
Applications compliant with this specification MUST implement these
AVPs.
Table 2 lists the new AVPs defined in this Diameter SIP application.
The following abbreviations are used in the Data-Type column:
o DURI: DiameterURI
o E: Enumerated
o G: Grouped
o OS: OctetString
o UTF8S: UTF8String
o U32: Unsigned32
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Diameter SIP Application Command Codes All the Diameter implementations conforming to this specification
MUST implement and support the list of Diameter commands listed in
Table 1.
+-------------------------------------+-------+------+--------------+
| Command Name | Abbr. | Code | Reference |
+-------------------------------------+-------+------+--------------+
| User-Authorization-Request | UAR | 283 | Section 8.1 |
| User-Authorization-Answer | UAA | 283 | Section 8.2 |
| Server-Assignment-Request | SAR | 284 | Section 8.3 |
| Server-Assignment-Answer | SAA | 284 | Section 8.4 |
| Location-Info-Request | LIR | 285 | Section 8.5 |
| Location-Info-Answer | LIA | 285 | Section 8.6 |
| Multimedia-Auth-Request | MAR | 286 | Section 8.7 |
| Multimedia-Auth-Answer | MAA | 286 | Section 8.8 |
| Registration-Termination-Request | RTR | 287 | Section 8.9 |
| Registration-Termination-Answer | RTA | 287 | Section 8.10 |
| Push-Profile-Request | PPR | 288 | Section 8.11 |
| Push-Profile-Answer | PPA | 288 | Section 8.12 |
+-------------------------------------+-------+------+--------------+
Table 1: Defined command codes
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Diameter Protocol 
