US 12,309,214 B2
Apparatus, method and computer program
Peter Leis, Penzberg (DE); and Lazaros Gkatzikis, Issy-les-Moulineaux (FR)
Assigned to Nokia Technologies Oy, Espoo (FI)
Appl. No. 17/797,349
Filed by NOKIA TECHNOLOGIES OY, Espoo (FI)
PCT Filed Feb. 6, 2020, PCT No. PCT/EP2020/053037
§ 371(c)(1), (2) Date Aug. 3, 2022,
PCT Pub. No. WO2021/155937, PCT Pub. Date Aug. 12, 2021.
Prior Publication US 2023/0055014 A1, Feb. 23, 2023
Int. Cl. H04B 7/00 (2006.01); H04L 65/1104 (2022.01); H04L 65/4061 (2022.01); H04W 4/10 (2009.01); H04W 4/16 (2009.01)
CPC H04L 65/4061 (2013.01) [H04L 65/1104 (2022.05); H04W 4/10 (2013.01); H04W 4/16 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
at least one processor; and
at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to:
receive, from a first client, a call request comprising address information for calling at least one second client, the address information being a Functional Alias, wherein the Functional Alias is activated by the at least one second client;
in response to receiving the call request at the apparatus, send, to a server, a request to resolve the Functional Alias to at least one Mission Critical Push to Talk Identifier of the at least one second client that has activated the Functional Alias;
receive, at the apparatus from the server, the at least one Mission Critical Push to Talk Identifier of the at least one second client;
receive, at the apparatus from the server, two or more Mission Critical Push to Talk Identifiers of the at least one second client;
in response to receiving the two or more Mission Critical Push to Talk Identifiers of the at least one second client, determine, based on a policy, whether to: send a call request to each Mission Critical Push to Talk Identifier of the two or more Mission Critical Push to Talk Identifiers; or select one Mission Critical Push to Talk Identifier of the two or more Mission Critical Push to Talk Identifiers to send the call request; and
based on the determining, send, from the apparatus, the call request to the at least one second client.