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¿µ¹®Ç¥Áظí 3GPP - Core Network and Terminals; Restoration procedures (Release15)
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3rd Generation Partnership Project;Technical Specification Group Core Network and Terminals;IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3(Release 17)
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3rd Generation Partnership Project;Technical Specification Group Core Network and Terminals;IP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) service continuity; Stage 3(Release 18)