Yealink SIP-T21 E2 Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
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Parameters
Permitted Values
Default
X ranges from 1 to 2 (for SIP-T21(P) E2)
X is equal to 1 (for SIP-T19(P) E2/CP860/CP920)
Note: DNSTTL, Registration and duration mode can only be processed when the IP phone is
idle (that is, no incoming/outbound calls, no active calls or meetings, etc.).
Web User Interface:
None
Phone User Interface:
None
account.X.sip_server.Y.failback_timeout
(X ranges from 1 to 16, Y ranges from 1 to 2)
0, Integer from
60 to 65535
3600
Description:
Configures the timeout (in seconds) for the phone to retry to send requests to the primary
server after failing over to the current working server for account X.
If you set the parameter to 0, the IP phone will not send requests to the primary server until
a failover event occurs with the current working server.
If you set the parameter from 1 to 59, the timeout will be 60 seconds.
X ranges from 1 to 16 (for SIP-T54S/T48G/T48S/T46G/T46S/T29G)
X ranges from 1 to 12 (for SIP-T52S/T42G/T42S)
X ranges from 1 to 6 (for SIP-T41P/T41S/T27P/T27G)
X ranges from 1 to 3 (for SIP-T40P/T40G/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
X is equal to 1 (for SIP-T19(P) E2/CP860/CP920)
Note: It works only if the value of the parameter “account.X.sip_server.Y.failback_mode” is
set to 3 (duration).
Web User Interface:
None
Phone User Interface:
None
account.X.sip_server.Y.failback_subscribe.enable
0 or 1
0
Description:
Enables or disables the IP phone to retry to re-subscribe after registering to the secondary
server with different IP address for account X when encountering a failover.
0-Disabled
1-Enabled

Yealink SIP-T21 E2 Specifications

General

Brand	Yealink
Model	SIP-T21 E2
Category	IP Phone
Language	English