Yealink SIP-T21 E2

Appendix
1015
of line key (line key is not applicable to SIP-T19(P) E2/CP860/CP920 IP phones), programable
key and ext key (ext key is only applicable to SIP-
T54S/T52S/T48G/T48S/T46G/T46S/T29G/T27P/T27G IP phones).
The following table lists the number of DSS keys you can configure for each phone model:
Phone Model
Line Key
Programable Key
Ext Key
SIP-T54S
27
13
60
SIP-T52S
21
11
60
SIP-T48G/S
29
13
40
SIP-T46G/S
27
13
40
SIP-T42G/S
15
11
/
SIP-T41P/S
15
11
/
SIP-T40P/G
3
11
/
SIP-T29G
27
14
39
SIP-T27P/G
21
14
39
SIP-T23P/G
3
11
/
SIP-T21(P) E2
2
11
/
SIP-T19(P) E2
/
11
/
CP860
/
8
/
CP920
/
8
/
Note
The programable key takes effect only if the IP phone is idle.
The ext key takes effect only if the expansion module is connected to the IP phone.