I think you should be ok. I would go ahead and just open up the SIP ports you need and try it. In the CUCM 6.x you can open up RTMT and watch the SIP traffic live coming/going on the server. Works out great for fixing issues.
On the Mitel, I cant remember on the 3300 if there is a monitor as well, but it will be handy to see that traffic.
In the beginning, I would open all ports to/from that IP address on your FW just to be safe. Then once you get it to work, lock it down to only TCP/UDP ports you need. (probably 5060 and 5070 I assume)
In the past here is how I have done PTPs with SBC.
They land the circuits on each end and give me the configurations. I install my routers and configure the physical layer so they are up/up. Then I add in my transports (IP) to take the traffic from point A to point B and vice versa.
Once that is up, then I can push any protocol I want through the pipe. I can even add Layer 3 QOS and prioritize the traffic because it's a PTP.
This is based off the assumption the PTP is what I described above. If its the product called IP Flex which provides SIP PSTN connectivity (ATT), then that is different.
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