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I recently added a Grandstream ATA (firmware v126.96.36.199 [latest]) to my snom ONE PBX (5.1.1 (Win64)). Caller ID works fine with the Grandstream ATA (i.e. the attached phone displays the CID) if the Trunk Routing/Redirection Default Account is set to the ATA's assigned extension. However, if the ATA extension is part of a Hunt Group where the Behaviour: From-Header is set to Calling-Party (or any other setting), the ATA's attached phone simply displays "Incoming Call". I don't have any experience debugging these kinds of problems and any help would be appreciated.