Method to detect calls on an AMR-WB capable network

摘要

Embodiments of the present invention include methods and arrangements to detect an end-to-end call on a AMR-WB capable network involving at least one monitored identity. According to an embodiment of the invention, call events related to the at least one monitored identity through at least one intercepting control element in a telecommunication network is monitored. A start notification message by the at least one intercepting control element is delivered 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.

主权项

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.