Yealink SIP-T54S Administrator's Manual page 1042

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
The following tables list relationship between the values of X in the following parameters and programable keys for each phone model.
# X ranges from 1 to 14.
programablekey.X.type =
programablekey.X.line =
programablekey.X.value =
programablekey.X.xml_phonebook =
programablekey.X.history_type =
programablekey.X.pickup_value =
# X ranges from 1 to 4.
programablekey.X.label =
Phone
Model
SIP-T19(P)
X
E2
1 SoftKey1
2 SoftKey2
3 SoftKey3
4 SoftKey4
5 Up
6 Down
1016
SIP-T23P/ SIP-T52S/T42G/
SIP-T29G/
T23G/ T42S/T41P/
T27P/T27G
T21(P) E2 T41S/T40P/T40G
SoftKey1 SoftKey1 SoftKey1
SoftKey2 SoftKey2 SoftKey2
SoftKey3 SoftKey3 SoftKey3
SoftKey4 SoftKey4 SoftKey4
Up Up
Down Down
SIP-
T54S/T48G/T48
CP860/CP
S/T46G/
T46S
SoftKey1 SoftKey1
SoftKey2 SoftKey2
SoftKey3 SoftKey3
SoftKey4 SoftKey4
Up Up
Down Down
920
Up
Down