Patent ID: 8681981

Claim:
A method for transmitting a subset voice stream associated with a subset talk group that is subset of a primary talk group, comprising: receiving, by a user voice communication device of the subset talk group, from an associated user data communication device engaged in a multimedia session, a session identifier that uniquely identifies a multimedia session, wherein the associated user data communication device is not a part of the primary talk group; transforming the session identifier into a session key identifier; obtaining, by the user voice communication device from an internal or external storage, an encryption algorithm supporting a subset talk group filtering feature and a voice encryption key identifier of the encryption algorithm, combining the session key identifier with the voice encryption key identifier to generate a signaling key identifier; and associating, by the user voice communication device, the signaling key identifier and an encryption algorithm identifier of the encryption algorithm with the subset voice stream during transmission of the subset voice stream to a receiving user voice communication device, wherein upon receipt of the subset voice stream, the receiving user voice communication device is configured to match the signaling key identifier and the encryption algorithm identifier with information stored on internal or external storage associated with the receiving user voice communication device, and to present the subset voice stream to an associated user if there is a match or suppress presentation of the subset voice stream if there is no match.