PhoneGnome "test number"?

[DracoFelis]

Some of us would like to setup our systems to be able to call PhoneGnome users. This is apparently easy to do, by following the instructions here:
http://www.phonegnome.com/faq_using.html#q13

However, "Murphy's Law" being what it is, any "untested link" is likely to "break" when you actually need it. So it would be nice to be able to test our "peering" (to PhoneGnome) in advance of actually "needing it". But to test a call out link, you really have to "call out" on it. And that's the problem, because who do you call (without disturbing someone)?

So I was wondering. Does anyone know of any good "test numbers", reachable from the PhoneGnome proxy? For example, an "Automated time" or an "Echo test" number would work great, because either one would let us test our setups without bothering anyone with "a test call". If so, what are good (PhoneGnome) "test" numbers, and what do you reach when you call those numbers?

[PhoneGnome]

You can send 11111111 (eight 1's) to the PhoneGnome SIP proxy to test passing a call to the PhoneGnome proxy. It's not really a PhoneGnome, so it doesn't test end-to-end, but it will test delivering of a call to the proxy.