Patent ID: 9307401
Filing Date: 2016-04-05
CPC Classification: H04L,H04W

Claim Text:
1. A method to detect an end-to-end call on an Adaptive Multi-Rate Wideband (AMR-WB) capable network involving at least one identity being monitored by a Law Enforcement Monitoring Facility (LMEF), the method comprising the following steps: monitoring call events related to the at least one identity monitored by the LMEF through at least one intercepting control element in a telecommunication network, delivering a start notification message by the at least one intercepting control element to the LMEF whenever an AMR-WB codec is chosen in the telecommunication network as a selected codec for an end-to-end call between the at least one monitored identity and another identity; and delivering an end notification message by the at least one intercepting control element to the LMEF whenever the adoption of the AMR-WB codec in the telecommunication network as the selected codec for the end-to-end call is terminated, wherein an AMR-WB decoder is applied to a call acquired at a monitoring facility within a time frame comprised between a starting time indicated by a time-stamp indicator associated to the start notification message and an ending time indicated by the time-stamp indicator associated to a subsequent end notification message.