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Cisco 7940/7960 and NAT using SIP

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Anyone know of a way to get the Cisco phones to communicate with the
TFTP server or register through a NAT, like any regular broadband
router? All the Polycoms I've tested seem to work perfectly even through
multiple NATs with no special configuration of any kind but I'll be
damned if I can even get port forwarding to work for the Cisco phones.
They won't even show up in Sylantro ComManager for registration.

Any suggestions are greatly appreciated.

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