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In some Microsoft applications, particularly Microsoft Excel and other Microsoft 365 desktop products, tel: hyperlinks may fail with an error stating "Cannot open the specified file", even though dialing works correctly elsewhere in Windows. Using the tel:// format resolves this issue and allows calls to launch successfully in supported phone applications.

As part of CWI’s transition to Microsoft Teams Phone, users may need to update their default calling application in Windows. This article provides simple steps to switch the default phone app from Cisco Jabber to Microsoft Teams so click-to-call links continue to work as expected.