There should not be any problem as long as the remote phones, doesn't matter they are on which network, can access your server in DMZ. But if you have a dynamic IP, you should get a dyndns FQDN (fully qualified domain name) for it and have your IP phones have that domain name to rech to your server. It will cost you $10 a year.
I have many phones here and there connecting to different servers and I never had any problems. Also my home server is in DMZ and I have connected to it from many different locations around the globe, it always worked perfect.
And yes, there are IAX phones out there too, but not good ones yet. I have an unbranded IAX phone in my basement, but thats the only place where I can put it because I can't rely on its voice quality.
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