1301 6.5 Kbps voice 1302 8.5 Kbps voice 1303 5.0 Kbps voice 1321 Use this audio option for speech or for video-based content with speech and background music over 28.8 Kbps modems. \nFrequency Response : 4 kHz. 1322 Use this audio option for speech or for video-based content with speech and background music over 56.6 Kbps modems or ISDN connections. \nFrequency Response : 4 kHz. 1323 Use this audio option for speech or for video-based content with speech over 28.8 Kbps modems. \nFrequency Response : 4 kHz. 1341 6.5 Kbps voice 1342 8.5 Kbps voice 1343 5.0 Kbps voice