WRT100- VOIP port forwarding/"opening?"

Hi all,
I'm trying to get two VOIP phones (actual phones, not soft phones ) set up at my company's newest satellite office.
I'm starting by just trying to get one to work.  I have set up that particular phone with a DHCP reservation (thanks, Linksys for adding that feature!), and attempting to forward the ports that the phone system manufacturer says I need to.  However, it's obvious that some of the traffic isn't getting through (if I dial a number on the phone from the remote office, I can hear the call progress, however the other party can't hear me talking on the VOIP phone).  The phone works fine when it's on the company's LAN at the main office.  Our phone tech, who installed the system, says he can get into the main office phone system from his office with an IP phone, and has in fact called me from our office phone system using the said phone.
This tech also claims I need to not use port forwarding, but rather "open the ports" on the router.  Huh? (I believe that this won't work unless both phones have public IP's...and I'm not going to do that! I couldn't anyways, the DSL connection only has one public IP).
Also, this is going to get real interesting when I have to add the second phone to the remote office...how is the router going to be able to forward ports to both phones (same port numbers)?  Thoughts, anybody?

Just for the record - I'm not a Linksys employee, and neither are 99.9% of the other posters on this board. Like the others, we answer questions like yours for the challenge and satisfaction of helping others.
I didn't spend a lot of time reading the documentation for your phone system, but I find it difficult to believe that it would need more than one IP. The control unit of the system should be able to handle what amounts to a form of network address translation (NAT) which is what the router does. If the system is working for you, that's a good thing, but you might want to contact the support people for the phone system and see if there's a better way to add more phones without needing additional IPs.
Putting multiple IPs into a DMZ can be accomplished in business class routers from Cisco and other manufacturers. The WRT series are designed for residential and small office applications.
Glad to see your problem is solved - good luck!

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