Yealink SIP-T21 E2

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
224
Phone Model
Accounts
SIP-T41P/T41S/T27P/T27G
<=6
SIP-T40P/T40G/T23P/T23G
<=3
SIP-T21(P) E2
<=2
SIP-T19(P) E2
1
CP860/CP920
1 (SIP/Cloud account)
<=2 (PSTN account)
The IP phones support SIP server redundancy for account registration. For more information,
refer to Server Redundancy on page 749. If you want to customize multiple DSS keys to
associate with an account, refer to Multiple Line Keys per Account on page 235. If you want to
configure the maximum number of concurrent calls per line key, refer to Multiple Call
Appearances on page 241.
Note
You can only register a Cloud account for CP860 IP phones via phone user interface. For more
information, refer to Yealink_CP860_User_Guide .