Sending Loudness Ratio

Handset:

The sensitivity of the handset connected to the dealer board is represented by the sending loudness ratio (SLR). This parameter was determined to 7.2 dB. Following ITU-T recommendations, the tolerance for this parameter is 7dB +- 3.5dB.

Microphone:

The SLR found for the  handfree was 9.1 dB for a distance of 40cm from the microphone. The recommended value for a hands-free terminal is 13dB +_ 4dB