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Watchguard Firebox 700 with a SIP VOIP phone

We have a client with a Watchguard Firebox 700 doing NAT.   We are attempting to hook up a SIP VOIP Phone (http://www.grandstream.com/pdf/GXP2000UsersManual.pdf).
The phone is grabbing an internal ip address assigned by DHCP from our server.
We are able dial out with out the problem.

We opened up all ports from the External ip address of where home system is located.  The logs show there is nothing being blocked.   My guess is the watchguard may not support SIP.  Does anyone have any experience with this?
2 Solutions
Have you configured the phone to use a STUN (SIP proxy) server?
Normally when confioguring SIP or H323, 1-1 NAT is recommended on WG FB boxes.

Have you got it to work yet?
OLMECIANAuthor Commented:
It ended up being an issue with the sip phone itself.
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