<div>
It ended up being an issue with the sip phone itself.
</div>


It ended up being an issue with the sip phone itself.

<div>
<div class="content wysiwyg-content">
We have a client with a Watchguard Firebox 700 doing NAT. &nbsp; We are attempting to hook up a SIP VOIP Phone (<a href="http://www.grandstream.com/pdf/GXP2000UsersManual.pdf" rel="ugc">http://www.grandstream.com/pdf/GXP2000UsersManual.pdf</a>). <br />
The phone is grabbing an internal ip address assigned by DHCP from our server. <br />
We are able dial out with out the problem. <br />
<br />
We opened up all ports from the External ip address of where home system is located. &nbsp;The logs show there is nothing being blocked. &nbsp; My guess is the watchguard may not support SIP. &nbsp;Does anyone have any experience with this?
</div>
</div>


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?

Watchguard Firebox 700 with a SIP VOIP phone

Software firewalls, also known as host-based firewalls, provide a layer of software on one host that controls network traffic in and out of that single machine. Most operating systems now include firewall software, but many available software firewalls include central distribution, antivirus systems and disaster recovery.

Software Firewalls

Hardware-based firewalls provide more sophisticated protection for inbound and outbound traffic than the simple Windows software firewall or the basic NAT firewalls found in routers. These devices implement techniques such as stateful packet inspection, deep packet inspection, and content filtering; and may include built-in antivirus and anti-malware protection.

Hardware Firewalls

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).