MicrosoftIlya Bukshteyn There is one remark. VVX Phones in Russian market are not working with SfB Online / Teams properly.
It's not possible to make P2P calls from/to VVX Phones purchased in Russia because they are not supporting SRTP from factory (at least that's what Polycom says in their community posts, i.e. https://community.polycom.com/t5/VoIP-SIP-Phones/SRTP-between-Polycom-VVX-400-version-5-9-6-2327-and-FreePBX/td-p/109804/page/2 ). To be honest I didn't find the exact legal note for that.
And so far we don't have any workaround for this as it's not possible to enable SRTP on the phone.
It has impacted timeline of migration and budgeting for some locations in Russia where VVX Phones were considered as a temporary Common Area Phone solution. So they have to be replaced with native Teams Phones i.e. Yealink.
This is something that should be counted in mind when you're migrating Russian market to Teams telephony and want to use VVX temporary.
Also interesting how this legal requirement affects Teams Phones usage in Russia i.e. Polycom CCX and Yealink T5*
