Routing incoming calls behind a single IP address

We've been running GnuGK with the "one IP per VC" feature; our GnuGK
has multiple secondary addresses on eth0 and each endpoint has a
static IP assigned to it in the gnugk.ini file. That's been working,
but ptlib seems to have a hard limit of 100 IPs.

I'm considering moving GnuGK to the cloud; specifically, Amazon. While
it may be possible to get Amazon to do the same thing; get 100 IP
addresses from them, and then bind them all to the eth0 of the GnuGK,
there's other ways I'm sure.

If I only have one IP address, how would inbound calls get routed to
the appropriate machine?

The reason that we deployed a "one-to-one" scheme is that it's so
difficult to type alphanumerics on a typical VC remote control, while
numbers and dots are easy, which is why I don't think that a URI-style
of address for incoming is workable.

Would it just be [email protected] (if the other side is a
Tandberg) or external.ip.address##12345 if the other side is a
Polycom?

Thanks.

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