Account Settings
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Working Server: Server 1 is configured with the domain name of the working server. For example
yealink.p-
bx.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.
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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 devices support Failover and Fallback server redundancy types. In some cases, you can deploy a com-
bination of the two server redundancy types. For more information on server redundancy, refer to
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
When you initiate a call, the phone will go through the following steps to connect the call:
1. Sends the INVITE request to the primary server.
2. If the primary server does not respond correctly to the INVITE (that is, the primary server responds to the INVITE
with 503 message or the request for responding with 100 Trying message times out (64*T1 seconds, defined in
)), then tries to make the call using the secondary server.
3. If the secondary server is also unavailable, the phone will try the fallback server until it either succeeds in mak-
ing a call or exhausts all servers at which point the call will fail.
At the start of a call, server availability is determined by SIP signaling failure. SIP signaling failure depends on
the SIP protocol being used as described below:
Summary of Contents for One Talk CP960
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