Bit confused; TANDBERG Gatekeeper TTC2-01 REV2 is a Gatekeeper, not an ISDN Gateway. Regardless of that, yes, you can register a C60 with an old TANDBERG GK (which this is), and route it from there to an ISDN Gateway, if that's what you are wanting to do.
TANDBERG GK user guide: http://www.ivci.com/pdf/videoconferencing_tandberg_gatekeeper_user_manual.pdf
/jens
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