Akuvox R20 Series - Security-Basic; 3.13.1. Web Password Modify; 3.13.2. Session time out

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Bandwidth consumption and sample rates.
PCMA: 64kbit/s 8kHz
PCMU: 64kbit/s 8kHz
G729: 8kbit/s 8kHz Least consumption
G722: 64kbit/s 16kHz Best quality
3.7. Account-Advanced
Go to Account->Advanced to configure advanced settings for
account.
3.7.1. Audio Codec
Sip Account: To choose which account to configure.
Audio Codec: R20 series support four audio codec: PCMA,
PCMU, G729, G722. Different audio codec requires different
bandwidth, user can enable/disable them according to
different network environment.