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Btw that may not be what you asked for, read your question again and realized I answered something a bit different :) However, the answer to your question would be quite alike, and you will probably need to do both what I previously said, and place the firewall before the router. Then you will have solved the no-IP problem, and only have left to allow incoming and outgoing VoIP packets, which may be possible on the basis of type of packets (VoIP) or may not, unfortunately I am not so very good at firewalls but I suspect that if there is no support for that specific packet format, you may be able to implement it by some sort of plugin or module.
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Btw that may not be what you asked for, read your question again and realized I answered something a bit different :) However, the answer to your question would be quite alike, and you will probably need to do both what I previously said, and place the firewall before the router. Then you will have solved the no-IP problem, and only have left to allow incoming and outgoing VoIP packets, which may be possible on the basis of type of packets (VoIP) or may not, unfortunately I am not so very good at firewalls but I suspect that if there is no support for that specific packet format, you may be able to implement it by some sort of plugin or module.

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Hello all!<br />
<br />
I have VoIP device D-Link DVG-1104TH and I dont have additional IP adress. <br />
So I want to place this device behind firewall PF (OpenBSD).<br />
Can I Do this? Is PF support H.323 protocol? <br />
<br />
Thanks,<br />
Serg
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Hello all!

I have VoIP device D-Link DVG-1104TH and I dont have additional IP adress. 
So I want to place this device behind firewall PF (OpenBSD).
Can I Do this? Is PF support H.323 protocol? 

Thanks,
Serg

VoIP behind PF firewall

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).