This post is about migrating SFB (Online) IP phones to Microsoft Teams SIP Gateway. In case you have still IP phones for Skype for Business (Online) and you want to keep these a bit longer, there is something you can (still) do. As long as your SFB IP phones are supported for Teams SIP gateway…
— Read on erik365.blog/2022/11/09/migrate-third-party-skype-for-business-ip-phones-to-microsoft-teams-sip-gateway/