Phone Numbers are not Callable in excel

Question

I have a formula set up to take a phone number and throw tel: infront of it to make the number callable. Upon clicking it, microsoft teams would open and the call would be placed. Now for idk how many months, this function has not worked. Sip:, callto:, tell:, tell:// all don't work. Why? And its been so long, how has microsoft not fixed this issue???

Answer 1

Hi @CH,

Thank you for posting your question in the Microsoft Q&A forum.

According to your concern, this can be an issue with Windows-protocol handler registration. Windows handles protocol links like tel: / sip: / callto: through the default app associated with that link type. You can try double checking the protocol settings by going to Settings > Apps > Default apps > scroll down and select choose Default by link type > ensure the protocol links are using Teams as its default app

I have researched through Microsoft product help and other official information sources, and the result turns out that this behavior is not likely a service incident but an unexpected behavior. There are also some customers who also reported their problems with protocols in Office products. You can refer to these threads and see whether you are experiencing the same circumstances as they did:

• CANNOT OPEN THE SPECIFIED FILE with tel:-hyperlink | Microsoft Community Hub
• Problem using 'tel' hyperlink in Excel and other Office desktop products - Software & Applications … (I'm providing this information as a convenience to you. The sites are not controlled by Microsoft, and I can't make any representations regarding quality, safety or suitability of any software or information found there. Please make sure you completely understand the risk before retrieving any suggestions from the above link)

Hope this information may help. If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.    

Thank you for your understanding and cooperation. I'm looking forward to your reply.

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Answer 2

Excel and Teams no longer honor tel:, sip:, or similar URI links in the way described because calling behavior is now controlled by Teams licensing/features and by how the calling integration is implemented in the client, not by Excel itself. When the calling capability or license is missing or restricted, the link can still appear as a hyperlink but the call will not be completed by Teams.

From the current Teams behavior documented for contact-card calls:

• If the account is not enabled for Enterprise Voice (or equivalent calling capability), Teams shows an error and does not place the call when initiating a call from UI elements such as a contact card.
• The same underlying calling capability is required for URI-based calls; if the account does not have the correct calling license/feature, Teams will not complete the call even if the tel: (or sip:/callto:) link is present and clickable in Excel.

To restore callable behavior, the environment must meet Teams calling requirements:

1. Ensure the user has the appropriate Teams calling license and is enabled for Enterprise Voice (or the current equivalent in the tenant’s calling configuration).
2. Verify that Teams can place calls successfully from within the Teams client itself (for example, from the Calls app or from a one-to-one chat) using the same account.
3. Once Teams calling works natively, tel: or sip: links opened from Excel will be handled by the default app (Teams) and calls should complete as before.

If Teams can already call users internally but not via links, and the account is limited to internal-only calling, the behavior is by design: the calling license only allows calls to people within the organization, not arbitrary phone numbers.

For persistent issues even with correct licensing, contact the organization’s IT admin or Microsoft support to review Teams calling configuration and default protocol handler settings on the device.

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References:

• "Couldn't complete the call" error when you call from a contact card