IR.65 IMS Roaming and Interworking Guidelines.

IR.92 IMS Profile for Voice and SMS.

GSMA (accessed January 21 2011).

RFC2401 Security Architecture for the Internet Protocol.

RFC2486 The Network Access Identifier.

RFC2617 HTTP Authentication: Basic and Digest Access Authentication.

RFC2833 RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals.

RFC3261 SIP: Session Initiation Protocol.

RFC3262 Reliability of Provisional Responses in the Session Initiation Protocol (SIP).

RFC3264 An Offer/Answer Model with SDP.

RFC3265 Session Initiation Protocol (SIP)-Specific Event Notification.

RFC3310 Hypertext Transfer Protocol (HTTP) Digest Authentication Using Authentication and Key Agreement (AKA).

RFC3311 The Session Initiation Protocol (SIP) UPDATE Method.

RFC3312 Integration of Resource Management and Session Initiation Protocol.

RFC3323 A Privacy Mechanism for the Session Initiation Protocol (SIP).

RFC3325 Private Extensions to the Session Initiation Protocol (SIP) for Asserted Identity within Trusted Networks.

RFC3327 Session Initiation Protocol (SIP) Extension Header Field for Registering NonAdjacent Contacts.

RFC3329 Security Mechanism Agreement for the Session Initiation Protocol (SIP).

RFC3455 Private Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the 3rd-Generation Partnership Project (3GPP).

RFC3550 RTP: A Transport Protocol for Real-time Applications.

RFC3551 RTP Profile ...

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