Digital text can be blocked · Visual
Blank chat
Open
The digital pane is
empty.
Agent
Fine
The call audio still
works.
Voice
Block
Text media never loads.
AV
Test
A machine without that
AV loads the text.
Admin
Allow
The AV exception is the
fix.
Admin
Separate
This is not the
Efficiency Mode symptom.
Admin
Match the symptom.
Sources and go deeper
Technical requirements PDF
.
vendor
. last checked 2026-10. Fetched for this lab in October 2026. Re-read before you buy hardware or open a firewall.
ITU-T E.164, international public telecommunication numbering
.
standard
. last checked 2026-10.