Yealink SIP-T31G Administrator's Guide

Administrator’s Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones
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Default -1, the phone will invoke “account.X.sip_server.Y.retry_counts” to take effect.
Parameter
account.X.outbound_proxy.Y.only_signal_with_registered
[1][2]
<MAC>.cfg
Description
It enables or disables the phone to only send requests to the registered outbound proxy server when
encountering a failover.
Note: It works only if “account.X.outbound_proxy.Y.register_on_enable” is set to 1 (Enabled) and
“account.X.outbound_proxy.Y.failback_mode” is set to 1, 2 or 3.
Permitted
Values
0-Disabled
1-Enabled
Default -1, the phone will invoke “account.X.sip_server.Y.only_signal_with_registered” to take effect.
Parameter
account.X.outbound_proxy.Y.invite_retry_counts
[1][2]
<MAC>.cfg
Description
It configures the number of retries attempted before sending requests to the next available outbound
proxy server when encountering a failover.
Permitted
Values
Integer from 1 to 10
Default -1, the phone will invoke “account.X.sip_server.Y.invite_retry_counts” to take effect.
Parameter
account.X.outbound_proxy.Y.failback_mode
[1][2]
<MAC>.cfg
Description
It configures the failback mode for the phone to retry the primary outbound proxy server in failover.
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, and so on).
Permitted
Values
0-newRequests: all requests are sent to the primary outbound proxy server first, regardless of the last
server that was used. If the primary outbound proxy server does not respond correctly, the phone will
try to send requests to the secondary outbound proxy server.
1-DNSTTL: the phone will send requests to the last registered outbound proxy server first. If the TTL
for the DNS A records on the registered outbound proxy server expires, the phone will retry to send
requests to the primary outbound proxy server.
2-Registration: the phone will send requests to the last registered outbound proxy server first. If the
registration expires, the phone will retry to send requests to the primary outbound proxy server.
3-duration: the phone will send requests to the last registered outbound proxy server first. If the time
defined by the parameter “account.X.outbound_proxy.Y.failback_timeout” expires, the phone will retry
to send requests to the primary outbound proxy server.
Default -1, the phone will invoke “account.X.sip_server.Y.failback_mode” to take effect.
Parameter
account.X.outbound_proxy.Y.failback_timeout
[1][2]
<MAC>.cfg
Description
It configures the timeout (in seconds) for the phone to retry to send requests to the primary outbound
proxy server after failing over to the current working server.
If you set the parameter to 0, the phone will not send requests to the primary outbound proxy server
until a failover event occurs with the current working server.
Note: It works only if “account.X.outbound_proxy.Y.failback_mode” is set to 3 (duration).
Permitted
Values
0, Integer from 60 to 65535
Default -1, the phone will invoke “account.X.sip_server.Y.failback_timeout” to take effect.
Parameter
account.X.outbound_proxy.Y.failback_subscribe.enable
[1][2]
<MAC>.cfg
Description
It enables or disables the phone to retry to re-subscribe after registering to the secondary outbound
proxy server with different IP addresses when encountering a failover.

Yealink SIP-T31G Specifications

General

Mounting kit	Yes
Number of handles included	1 pc(s)
Display diagonal	2.3 \
Display resolution	132 x 64 pixels
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Voice codecs	G.722, G.729, AGC, G.729A, AJB, PLC, G.711Mu, VAD, G.711a, G.723.1, G.726, iLBC, CNG, OPUS
AC adapter input voltage	100 - 240 V
AC adapter output current	0.6 A
AC adapter output voltage	5 V
Power consumption (typical)	3 W
Lines quantity	2 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	2
Sustainability certificates	RoHS, REACH
Networking standards	IEEE 802.3af, IEEE 802.1p, IEEE 802.1Q, IEEE 802.1x
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Gray
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	189 mm
Width	188 mm
Height	162 mm
Package depth	210 mm
Package width	213 mm
Package height	103 mm