03.503GPPTransmission planning aspects of the speech service in the GSM Public Land Mobile Network (PLMN) systemTS
B.1.1 Sinusoidal signals
Unless specified otherwise, sinusoidal signals shall be used for testing the characteristics of the handset and headset MS.
B.1.2 Artificial voice
Unless specified otherwise, artificial voice shall be used for testing all the characteristics of the handsfree MS, and acoustic echo loss and stability loss of handset and headset MSs.
The artificial voice shall be in conformance with ITU‑T Recommendation P.50, and shall cover the fourteen 1/3 octave bands with a centre frequency between 200 Hz and 4 kHz or the 1/12 octave bands with a centre frequency between 200 Hz and 4 kHz. Outside these bandwidths the signal shall be filtered with a minimum slope of 24 dB/octave.
A "male" and a "female" artificial voice shall be used.
The artificial voice signal level shall be averaged over a period of 10 seconds. Unless specified otherwise, the averaging time for all the tests shall be 10 seconds.