FTAM — Active vs. passive connect for file transfer (Firewalls....)

n Section 4.5.2, the specification provides a sample skeleton of the
transfer operation where the protocol information available for the
destination FileTransferSession is "TCP/IP" with a listening address
of "255.255.25.1:8001"

The specification is requiring that the receiver of a file must allow
incoming connections.

Forcing the sender to always connect() and the receiver to always
listen() will cause unnecessary trouble with firewalls.

Since any file transfer could also be accomplished by allowing the
sender to listen and the receiver to make the active connection the
protocol specification should allow for active, passive (or either)
connections.

(A similar issue was raised against the A/V streams spec: issue #2053)

see above