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This service allows speech conversation of a predefined group of service subscribers in half duplex mode on the radio link taking into account multiple mobile service subscribers involved in the voice group call service VGCS call per cell. The VGCS is applicable to all mobile stations in a certain network and area which have the technical capability and the corresponding subscription, respectively, to participate in a VGCS call
!!!) Voice Calls Service Graph
Were you can send Voice calls to all DND & non DND numbers with your own mobile number as sender id (Example: - 9619XXXXXX).