As most of you already know, MS Teams works with two main protocols: UDP and TCP. Microsoft and most other VOIP solution providers recommend using Teams with UDP rather than TCP. The purpose of this article is to understand why and in which condition it matters.
Moreover, what ports are used by Microsoft Teams?
Microsoft Teams, as part of the Microsoft 365 and Office 365 services, The UDP 3478-3481 and TCP 443 ports are used by clients to request service for audio visuals. A client uses these two ports to allocate UDP and TCP ports respectively to enable these media flows.
For Teams to function properly (for users to be able to join meetings etc.), customers need to configure their internet access such that outbound UDP and TCP traffic to services in the Teams cloud is allowed. For more details, see here: Office 365 URLs and IP address ranges.
Does microsoft teams use sip?
Different communication apps like Chat, Meetings, and Calling are all exposed through UX App Window. However, Teams require IP-based voice connections, so SIP would serve the purpose.
Softphones can also use SIP technology, enabling you to download your business phone technology onto most mobile devices and desktop computers. Microsoft’s SIP Gateway solution enables core Teams calling functionality on legacy SIP phones.
This of course begs the inquiry “What is the Microsoft Teams integration with SIP phones?”
The Microsoft Teams integration with SIP phones means you can call a SIP phone from the Teams app and call into a Teams meeting using a SIP phone. You can move seamlessly between voice calls, chat and Teams meetings.
Does Microsoft SIP support third-party SIP proxies?
Microsoft does not support having a third-party SIP proxy or User Agent Server between the Microsoft SIP proxy and the paired SBC, which might modify the Request URI created by the paired SBC.
Employees can use messaging, chat or Microsoft Teams to communicate and collaborate with each other. The Microsoft Teams integration with SIP phones means you can call a SIP phone from the Teams app and call into a Teams meeting using a SIP phone.