Thanks martin, ron, et al for your comments.
ron,
Voxalot would tie everything up nicely, except for the fact that my VSP-ISP's SIP server blocks/ignores SIP traffic from outside.
I think I'm going to have to either use Asterisk / Asterisk@Home / SER, or perhaps setup some kind of UDP proxy to pass Voxalot's signalling traffic through on the way to my VSP. Probably may as well just use Asterisk.
Although with one Asterisk box, I should be able to organise seemless ENUM lookups and/or peering for other people connected to the same ISP - kind of like replicating Voxalot's setup, but within the ISP's domain (so their SIP servers will talk to us).
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