Allowing iPhone through firewall

Hi...
We use a Shorewall firewall with very restrictive policies on our network. I'm trying to figure out how to allow the iPhone through the network when connected via the cellular network. I was originally thinking allow it though by MAC address, however if I'm not mistaken, the cellular side doesn't have a MAC address.
We obviously can't use IP address. So I'm somewhat stumped at this point. I really don't want to have to VPN in first if possible.
Thanks.

Ok. Not sure I understand though. Your voip server is also your firewall? And only known IP addresses and/or MAC addresses are allowed to connect inbound?
Sorry, I don't mean to patronize, I'm really just thinking out loud here...so feel free to tell me to shut up. But a network with such a restrictive policy would probably consider the iPhone an insecure device even if you could identify it's address. It doesn't have hardware encryption so if stolen, it wouldn't be too hard to harvest data.
I'm assuming you need network access to data more than say, Exchange email. In that case a VPN seems like the obvious solution but you have reasons for not wanting to use it.
Of course for email or vpn there are subnetting, firewall, and routing options that would prevent unwanted protocols from reaching more secure parts of a network, if you can be more specific I'll offer what suggestions my experience has provided.

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