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3 specifications found, displaying 1 to 3
Specification NumberTypeTitleStatusPrimary Responsible Group 
22.173TSIP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1Under change control S1
See details Internal Common IMS 2G 3G LTE 5G
22.183TSCustomized Ringing Signal (CRS) requirements; Stage 1Under change control S1
See details Internal Common IMS 2G 3G LTE 5G
24.183TSIP Multimedia Subsystem (IMS) Customized Ringing Signal (CRS); Protocol specificationUnder change control C1
See details Internal Common IMS 2G 3G LTE 5G