9.2. Base standards
The following specifications define the basic procedures and architecture as used in the following chapters:
| 3GPP TS 23.228 | IP Multimedia Subsystem (IMS). |
| 3GPP TS 24.229 | IP Multimedia Call Control Protocol based on SIP and SDP. |
| RFC3261 | SIP: Session Initiation Protocol |
| 3GPP TS 24.228 | Signaling flows for IP multimedia call control based on SIP and SDP. This standard provides example call flows for procedures within the IMS. |
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