Don't ask me how or why - Selintra will have to explain but OTR works for me:
I previously had created an ibay called INTRANET with the following attributes: "Group" => OFFICE (Internal), "User access via file sharing or user ftp" => write=group read=everyone, "Public access via web or anonymous ftp" => Entire Internet (password required outside local network). The full directory path being /home/e-smith/files/ibays/intranet
One day I noticed a folder called "voicemail" had been created. The contents contained all call recordings that had been made by anyone using the *1 code. The filenames were in the format: auto-xxxxxxxxxx-Calling_Number-Called_Number.wav
Hope that helps.