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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.
That is an excellent use case for a webrtc server rather than an usual voice communication. If you decide to go that way, you don't need any sim card. You just need an internet access. You install a webrtc client (the usual one is coturn). I don't know if you also need to set up some kind of chat server in addition.
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