Yealink T40G Administrator's Guide

Account Settings
217
 Working Server: Server 1 is configured with the domain name of the working server. For example:
yealink.pbx.com. DNS mechanism is used such that the working server is resolved to multiple
servers with different IP addresses for failover purpose. The working server is deployed in redundant
pairs, designated as primary and secondary servers. The primary server (for example, 192.168.1.13)
has the highest priority server in a cluster of servers resolved by the DNS server. The secondary
server (for example, 192.168.1.14) backs up a primary server when the primary server fails and offers
the same functionality as the primary server.
 Fallback Server: Server 2 is configured with the IP address of the fallback server. For example,
192.168.1.15. A fallback server offers less functionality than the working server.
Yealink IP phones support Failover and Fallback server redundancy types. In some cases, you can deploy
a combination of the two server redundancy types. For more information on server redundancy, refer to
Server Redundancy on Yealink IP Phones.
Topics
Behaviors When Working Server Connection Fails
Registration Method of the Failover/Fallback Mode
Fallback Server Redundancy Configuration
Failover Server Redundancy Configuration
Behaviors When Working Server Connection Fails
For Outgoing Call

Yealink T40G Specifications

General

SIP Accounts	3
Wall Mountable	Yes
Opus Codec	No
Display	2.3 inch 132x64-pixel graphical LCD
Network	Dual-port Gigabit Ethernet
PoE	Yes
Headset Support	Yes, RJ9 port
Power Adapter	Optional
Voice Codecs	G.722, G.711(A/μ), G.729AB, G.726
Local Phonebook	1000 entries