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My first answer was https://silence.im/. However it seems to be semi abandoned and unmaintained.
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The other option is https://jami.net/. It seems to have a phone option and could potentially replace your current system.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.