Yealink SIP-T54S Administrator's Manual page 887

Configuring Audio Features
Permitted
Parameters Default
Values
When audio codec is PCMU, the default value is 2;
When audio codec is PCMA, the default value is 3;
When audio codec is G729, the default value is 4;
When audio codec is G726_16, the default value is 0;
When audio codec is G726_24, the default value is 0;
When audio codec is G726_32, the default value is 0;
When audio codec is G726_40, the default value is 0;
When audio codec is iLBC, the default value is 0;
When audio codec is G723_53, the default value is 0;
When audio codec is G723_63, the default value is 0;
When audio codec is opus, the default value is 0;
For CP920:
When audio codec is G.722_1c_48, the default value is 1;
When audio codec is G.722_1c_32, the default value is 2;
When audio codec is G.722_1c_24, the default value is 3;
When audio codec is G.722_1_24, the default value is 4;
When audio codec is G722, the default value is 5;
When audio codec is PCMU, the default value is 6;
When audio codec is PCMA, the default value is 7;
When audio codec is G729, the default value is 8;
When audio codec is G726_16, the default value is 0;
When audio codec is G726_24, the default value is 0;
When audio codec is G726_32, the default value is 0;
When audio codec is G726_40, the default value is 0;
When audio codec is iLBC, the default value is 0;
When audio codec is G723_53, the default value is 0;
When audio codec is G723_63, the default value is 0;
When audio codec is opus, the default value is 0;
Example:
account.1.codec.g722_1c_48kpbs.enable = 1
account.1.codec.g722_1c_32kpbs.enable = 2
account.1.codec.g722_1c_24kpbs.enable = 3
account.1.codec.g722_1_24kpbs.enable = 4
account.1.codec.g722.priority = 5
account.1.codec.pcmu.priority = 6
account.1.codec.pcma.priority = 7
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