Yealink VC400 Administrator's Manual page 146

Administrator's Guide for Yealink Video Conferencing Systems
The following example shows the way calls are placed when account polling is enabled or
disabled
Scenario:
System A is registered with a Yealink Cloud account and a SIP account.
1.
On system A, select Auto from the pull-down list of Call Type before calling.
2.
On system A, dial the account numbers of system B.
3.
Result：
If account polling is disabled, system A can only use its Cloud account (highest priority) to

call system B.
If account polling is enabled, system A will use its Cloud account (highest priority) to call

system B first. If this call fails, system A continues to use its SIP account (next priority) to
call system B.
Account polling parameters on the system are described below:
Parameter
Account Polling
130
Description
Enables or disables the account
polling feature.
Disabled-If call type is set to

Auto, the system can only call
other systems using the call type
with the highest priority.
Enabled- If call type is set to

Auto, the system will attempt to
Configuration Method
Remote Control
Web User Interface