I believe Merlinman is correct, unless your software is doing something else. The following text is from the Magix Feature Reference guide R3.0:
Trunk-to-Trunk Transfer
Users can transfer inside or outside calls either to inside extensions or to outside numbers. Trunkto-
trunk transfer (an outside call transferred to an outside number) is not allowed when the line/
trunk with the incoming call is a loop-start line that is not programmed for reliable disconnect. (The
Reliable Disconnect setting indicates that a disconnect signal is sent by the local telephone
company to the system shortly after a caller hangs up.)
Trunk-to-trunk transfers can be blocked for an extension, whether or not the lines/trunks involved
are programmed for reliable disconnect. The factory setting restricts all extensions from making
trunk-to-trunk transfers. Extensions that should not be restricted must be individually programmed
to allow trunk-to-trunk transfer.
Transfers to non-local dial plan extensions are actually trunk-to-trunk transfers, although users
initiate them as they do inside transfers. Most extensions, including those equipped with single-line
telephones, can make these calls, regardless of system programming to allow or disallow trunk-totrunk
transfers.
When an Automated Attendant transfers a call to a non-local extension, the transferring MERLIN
MAGIX system monitors the call to ensure that it is answered. If the non-local extension is not
available or the call is not answered within the transfer redirect timeout period (fixed at 32
seconds), the call stops ringing at the non-local destination and is redirected to the extension on
the same system as the Automated Attendant that is programmed to receive redirected calls. This
redirect extension can be a QCC queue, a Calling Group, or an individual extension.
You cannot use a single-line telephone connected to a tip/ring port to make a trunk-to-trunk
transfer.
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The same holds true for the Legend, and I know that from the systems I have worked on, the feature does not work without the T-TO-T feature active for the station forwarding.
....JIM....