When used in mobile phone networks, there are three different configurations (combinations of bitrates) that may be used for voice channels:
Configuration A (Config-WB-Code 0): 6.6, 8.85, and 12.65 kbit/s (Mandatory multi-rate configuration) Configuration B (Config-WB-Code 2): 6.6, 8.85, 12.65, and 15.85 kbit/s Configuration C (Config-WB-Code 4): 6.6, 8.85, 12.65, and 23.85 kbit/s*
When used in mobile phone networks, there are three different configurations (combinations of bitrates) that may be used for voice channels: