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Hello,
It's possible to connecting Microsoft team to SIP provider such as skype connect or call centric to make domestics and international call?
Have you looked at SIP Gateway?
https://learn.microsoft.com/en-us/microsoftteams/sip-gateway-plan
"SIP Gateway lets your organization use any compatible SIP device with Microsoft Teams to preserve your investments in SIP devices. Now you can sign-in to Teams with your corporate credentials and make and receive calls with a compatible SIP device. Compatible devices can be Skype for Business IP phones with standard SIP firmware, Cisco IP phones with multiplatform SIP firmware, or SIP devices from vendors such as Poly, Yealink, and AudioCodes. To find out how to configure your SIP devices for SIP Gateway, see Configure SIP Gateway."
Check if your devices are compatible on the link provided above.
If this is helpful please accept answer.
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Yes, it is possible to connect Microsoft Teams to a SIP provider such as Skype Connect or Call Centric to make domestic and international calls. However, the exact steps to set this up will depend on the specific SIP provider and the configuration of your Microsoft Teams account.