Yealink VC400 User Manual page 98

User Guide for the VC400 Video Conferencing System
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.
To configure account polling via web user interface:
Click on Setting->Call Features.
1.
Select the desired value from the pull-down list of Account Polling.
2.
If you select Disabled, the system can only call other systems using the call type with
-
the highest priority.
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