Yealink SIP-T2 SERIES Administrator's Manual page 826

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
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 = 2
Note: For SIP VP-T49G IP phones, numerical value 0 is defined as the highest priority
in the enable codec list and disable codec list. For
SIP-T48G/T46G/T42G/T41P/T40P/T29G/T27P/T23P/T23G/T21(P) E2/T19(P) E2 IP phones,
the priority of codec in disable codec list is not specified, and numerical value 1 is
defined as the highest priority in the enable codec list.
Web User Interface:
Account->Codec->Audio Codec
Phone User Interface:
None
account.X.codec.Y.rtpmap
(X ranges from 1 to 16, Y ranges from 1 to 15)
Description:
Configures the rtpmap of the audio codec for account X.
X ranges from 1 to 16 (for SIP VP-T49G/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-T40P/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
X is equal to 1 (for SIP-T19(P) E2/CP860)
Y ranges from 1 to 15 (for SIP VP-T49G)
Y ranges from 1 to 11 (for SIP-T48G/T46G/T42G/T41P/T29G/CP860)
Y ranges from 1 to 9 (for SIP-T40P/T27P/T23P/T23G/T21(P) E2/T19(P) E2)
For SIP VP-T49G:
When Y=1, the default value is 0;
When Y=2, the default value is 8;
When Y=3, the default value is 4;
When Y=4, the default value is 18;
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Parameters
Permitted
Default
Values
Integer
Refer to the
following content
from 0 to 127