Exam MS-721 topic 1 question 66 discussion

it should be e5

A is correct. - We need 'Phone System'. https://teams-phone.com/microsoft-365-licenses-required-for-telephony-on-microsoft-teams > Office 365 E5 and Microsoft 365 E5 subscriptions include the Phone System and Audio-conferencing add-ons which allow you to switch to telephony at no additional cost. > Office 365 E1, Office 365 E3 and Microsoft 365 E3 subscriptions require at least the Phone System add-on to use telephony on Teams.

A is correct

he answer is C. Microsoft 365 E3 or Microsoft 365 E5. Here's a breakdown of why these licenses are required for PSTN calling with an SBC: PSTN Calling Capabilities: Both Microsoft 365 E3 and E5 include the Phone System add-on, which provides the essential features for making and receiving calls to and from the public switched telephone network (PSTN). SBC Integration: These licenses also support the integration of a Session Border Controller (SBC), a crucial device that manages calls between Teams and the PSTN, ensuring security and interoperability. Other Licenses Lack Phone System: While Office 365 E3 and E5 may include some communication features, they don't provide the full Phone System capabilities required for PSTN calling with an SBC.

La respuesta es la "A", solos las licencias de Office 365 E5 y M 365 E5 incluyen el addon de Phone System Standard

As per: https://www.call2teams.com/blog/microsoft-teams-phone-licensing-explained/

C. Microsoft 365 E3 or Microsoft 365 E5

E5 in my opinion