When Y=8, the default value is 0; 
When Y=9, the default value is 0; 
When Y=10, the default value is 0; 
When Y=11, the default value is 0; 
For SIP-T27P/T23P/T23G/T21(P) E2: 
When Y=1, the default value is 2; 
When Y=2, the default value is 3; 
When Y=3, the default value is 4; 
When Y=4, the default value is 1; 
When Y=5, the default value is 0; 
When Y=6, the default value is 0; 
When Y=7, the default value is 0; 
When Y=8, the default value is 0; 
When Y=9, the default value is 0; 
Example: 
account.1.codec.1.priority = 1 
Web User Interface: 
Account->Codec 
Phone User Interface: 
None 
Description: 
Configures the rtpmap of the audio codec for account X. 
X ranges from 1 to 16 (for SIP-T48G/T46G/T29G). 
X ranges from 1 to 12 (for SIP-T42G). 
X ranges from 1 to 6 (for SIP-T41P/T27P). 
X ranges from 1 to 3 (for SIP-T23P/G). 
X ranges from 1 to 2 (for SIP-T21(P) E2). 
For SIP-T48G/T46G/T42G/T41P/T29G: 
When Y=1, the default value is 0; 
When Y=2, the default value is 8; 
When Y=3, the default value is 4;