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During Call Transfer, if I select 'Displayed Caller ID' as "User's Number",  the call is getting transferred to main number, but the the extension is not working. But when I select 'Displayed Caller ID' as "Retell Agent's Number", the call is getting transferred to main number and extension number as well. suggest how to solve.

Hello <@1361773912341483520> , can you share a call id

The warm transfer with the user's number with custom telephony, you have to contact your provider to allow it

Thanks, even if I use cold Transfer the extensions won't work.

hey, it still doesnt work for use even if we have bought a number from Retell!