Here is the list of codecs supported by Asterisk VQM:
G.711 ulaw (as used in US)
G.711 alaw (as used in Europe)
G.722 – 16 kHz wideband codec
G.726 – 32kbps only (16/24/32/40kbps supported in format_g726 for files
G.729 – may require a license
Basically, all codecs supported by Asterisk PBX are supported by Asterisk VQM. When narrowband codec used for transmission quality assessment is performed by AQuA Voice, and in case of wideband codec MOS score is obtained by AQuA Wideband.