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2 specifications found, displaying 1 to 2
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
22.273TSTISPAN; Multimedia Telephony with PSTN/ISDN simulation servicesUnder change control S1
See details Internal Common IMS 2G 3G LTE 5G