Call Monitoring and Quality
The InnoMedia ESBC provides monitoring features such as a Call History, real-time Call States, Media and Packet loopback for server-based Voice Quality Measurement, R-Factor and MOS calculations for every call, and SNMP Traps based on configurable thresholds of network call parameters.

Call History
The Call History feature allows operators to see CDR-like information for each call as well as call quality metrics. A list view of all calls providing high-level information is augmented with more specific detail for each call including MOS scores, R-factor, packet loss, delay and jitter values.

Call statistics are provided for both of the following directions:

• WAN connection to the operator’s network
• LAN connection to the enterprise network

The evolution of MOS scores can also be viewed over time in each of these directions to allow rapid identification of quality problems and root cause analysis.

Call States
Real-time call states can be viewed for LAN-side SIP UA’s, FXS ports and SIP Trunks.

Voice Quality Measurement (VQM)
The ESBC also works in conjunction with the InnoMedia Element Management System (EMS) Server for monitoring and analysis of MOS scores, Data Network Traffic and CDR information.

One example of the ESBC and the EMS working together is in Voice Quality Measurement (VQM).

The EMS sets up a test call to the ESBC and the following steps occur:

• The EMS contacts the ESBC and the device places itself into loopback mode
• The EMS sends a reference speech utterance downstream to the ESBC
• Speech is looped back at the ESBC and returns to the EMS Server
  • Both packet and media loopback are possible
• The EMS compares reference and degraded speech using PESQ analysis
  • Note that this process is NOT based on the ITU-T E-model analysis which purely uses incoming packet loss, jitter, delay statistics
• The EMS generates estimated MOS score, packet loss, jitter, delay values for the call

This process allows an immediate, active measurement of Voice Quality on path to the ESBC.

Through the use of Test Agents on the ESBC (which act as normal SIP endpoints as far as the Voice Provider network is concerned), VQM is possible even when the ESBC is behind a Firewall/NAT device.

The VQM operation can be done either (a) manually for an instant measurement, or (b) on a scheduled basis for regular voice quality measurements.

Bidirectional VQM is an enhancement of the above approach where separate reference speech utterances are used in the EMS-to-ESBC and the ESBC-to-EMS directions.

This allows the operator to determine network quality impairments in each direction separately.