Plus adapters speak HTTPS and WSS · Visual
Pop fails, voice works
Audio
The caller is heard.
Phone
WSS
The pop channel tries to
open.
Adapter
Block
The proxy does not
understand WSS.
Proxy
Blank
The CRM pane stays
empty.
Adapter
TLS
TLS 1.1 will not be
accepted.
Admin
Fix
Allow WSS and TLS 1.2.
Admin
Voice can live while the pop dies.
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.
Web adapter requirements
.
vendor
. last checked 2026-10.
RFC 8446, TLS 1.3
.
rfc
. last checked 2026-10.
RFC 6455, The WebSocket Protocol
.
rfc
. last checked 2026-10.