This link is just for demoing the swagger UI used for debugging
Can be extened for Public Switched Telephone Network(PSTN) calls and Dual-Tone Multi-Frequency(DTMF).
Requires Azure AD tenant, M365 licence(Teams) in order to function properly.
PSTN functionality will require a Azure AD application registered with a phone number.
go to https://hackmd.io/@W3dVRjFTRAGwIs-QMSbwuA/Hkdb2dkX3 for mandarin chinese deployment guide.