Method and system for group call using unicast and multicast

A group call method performed by a server, the method comprising:

• establishing a media session with a first client device based on a group call request from the first client device, to initiate a group call;
• receiving, from the first client device through the media session, at least one first packet including a first source identifier of the first client device;
• broadcasting the at least one first packet to each of a plurality of second client devices participating in the group call;
• receiving, from the first client device through the media session, at least one second packet comprising a second source identifier of at least one second client device selected from the plurality of second client device, as a destination of data included in the at least one second packet;
• and
• transferring data included in the at least one second packet to the at least one selected second client device in a form of unicast or multicast, based on the second identifier of the at least one selected second client device.

A computer apparatus comprising:

• at least one memory configured to store computer-readable instructions;
• and
• at least one processor configured to execute the computer-readable instructions to:
• establish a media session among a first client device, a server providing a group call service, and a plurality of second client devices, based on a group call request from the first client device,
• receive, from the first client device through the media session, at least one first packet including a first source identifier of the first client device,
• broadcast the at least one first packet to each of the plurality of second client devices participating in a group call initiated by the first client device,
• receive, from the first client device through the media session, at least one second packet comprising, as a destination of data included in the at least one first packet, a second source identifier of at least one second client device selected from the plurality of second client devices, and
• transfer data included in the at least one second packet to the at least one selected second client device in a form of unicast or multicast, based on the second source identifier of the at least one selected second client device.