Yealink SIP-T2xP Auto Provisioning Manual page 259

Parameter
account.X.codec.Y.payload_type =
(SIP-T28P/T48G/T46G: X ranges from 1 to 6.
SIP-T26P/T22P/ T42G/T41P: X ranges from 1 to 3.
SIP-T21P/T20P: X ranges from 1 to 2.
SIP-T19P/CP860: X=1.
SIP-T28P/T26P/T22P/T20P/CP860: Y ranges from 1 to
11.
SIP-T21P/T19P: Y ranges from 1 to 8.
SIP-T4X: Y ranges from 1 to 12.)
Permitted Values
Ring8.wav Note: Ring tones 6-8 are only applicable to
SIP-T48G/T46G IP phones.
It configures the codec for account X.
Codecs G726-16, G726-24 and G726-40 are
not applicable to SIP-T21P and SIP-T19P IP
PCMU phones.
PCMA Codec GSM is only applicable to SIP-T4X IP
phones.
G729
For SIP-T28P/T26P/T22P/T20P/T4X/CP860 IP
G722
phones:
G723_53
When Y=1, the default value is PCMU;
G723_63
When Y=2, the default value is PCMA;
G726-16
When Y=3, the default value is G723_53;
G726-24
When Y=4, the default value is G723_63;
G726-32
When Y=5, the default value is G729;
G726-40
When Y=6, the default value is G722;
iLBC
When Y=7, the default value is iLBC;
GSM
When Y=8, the default value is G726-16;
When Y=9, the default value is G726-24;
When Y=10, the default value is G726-32;
Descriptions
Account->Codec
Appendix
Web Setting Path
249