US 12,278,928 B2
Method, system, and program element for optimizing an abandoned call notification
Sofia Anagnostou, Nea Erythrea (GR); Grant Milner, Erie, CO (US); Athanasios Pagonis, Vrilissia (GR); and Zisis Tsiatsikas, Salonika (GR)
Assigned to Unify Beteiligungsverwaltung GmbH & Co. KG, Munich (DE)
Filed by Unify Patente GmbH & Co. KG, Munich (DE)
Filed on Oct. 20, 2022, as Appl. No. 17/970,316.
Claims priority of application No. 22151430 (EP), filed on Jan. 13, 2022.
Prior Publication US 2023/0224405 A1, Jul. 13, 2023
Int. Cl. H04M 3/51 (2006.01); H04M 3/42 (2006.01)
CPC H04M 3/5116 (2013.01) [H04M 3/42357 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for optimizing an abandoned call notification, comprising:
an Emergency Service Routing Proxy (ESRP) element in an Emergency Service Internet Protocol network (ESInet) receiving a call from a caller device of caller;
verifying, by the ESRP element, that the call is considered abandoned;
performing, by the ESRP element, a rebid to obtain a fresh update of the caller location;
performing, by the ESRP element, an Emergency Call Routing Function (ECRF) query to obtain routing information of an original routing target Public Safety Answering Point (PSAP) element for the call;
sending, by an ESRP destination of the original routing target PSAP, to the ESRP element a Session Initiation Protocol (SIP) Notify message that carries the state of the original routing target PSAP;
verifying, by the ESRP element, whether the state of the original routing target PSAP is functional;
sending, by the ESRP destination, to the ESRP element a SIP Subscribe request message for abandoned call details; and
sending, by the ESRP element, to the ESRP destination a SIP Notify message which carries the abandoned call details.