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ElalfZek Posted:
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Hard Wiring - Installation
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On Nov 19, 2017 at 02:16:33

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In The Forum:
Hard Wiring - Installation
Topic:
Hardwiring in a Rental House
On Oct 24, 2017 at 22:29:48

mikebrown Posted:
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In The Forum:
Hard Wiring - Installation
Topic:
Hardwiring in a Rental House
On Jun 24, 2017 at 09:15:34

Haniltery Posted:
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On May 02, 2017 at 17:28:06

dconnor Posted:
What is the main
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In The Forum:
Vonage UK
Topic:
How do you call 999
On Apr 27, 2017 at 18:52:02

Trafford Posted:
Seems like a
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rely exclusively
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for our
...

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Topic:
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On Apr 27, 2017 at 10:42:50

diazou Posted:
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In The Forum:
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Topic:
IP PBX for small business
On Mar 28, 2017 at 12:42:33

jeddaisg Posted:
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In The Forum:
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Topic:
Ethernet Cable; Wiring schematic? 568-B?
On Feb 23, 2017 at 18:33:52

beast321 Posted:
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In The Forum:
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Topic:
Using phone as a dial up modem for Dreamcast Gaming
On Feb 16, 2017 at 03:16:51


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Vonage It has nothing to do with the port. The source port of your device for the SIP protocol



It has nothing to do with the port. The source port of your device for the SIP protocol is 10000. The destination port for the SIP proxy is 10000. The firewall is not blocking based upon IP or port. It is inspecting the packet and does not like the algorithm so it blocks it. This is because it has an Application Layer Gateway which finds the SIP protocol and tries to perform what is believes is a help mechanism but actually breaks it.

Your device will send out a Register every 20 seconds and under normal conditions will get a response back. This what keeps the NAT pinhole open. However, your SBG-900 is not letting the response pass back to the Vonage adapter. This is why port forwarding does nothing to help.

Port forwarding is used when a service is idle and just waiting for a connection. When a packet arrives from outside your NAT firewall on the Public IP, the NAT table will know how to translate that packet back to the Private IP of the host machine for the service because you told it where to go when a certain port was hit on from the outside.

So since the Vonage adapter sends out a Register packet, it is the same as you opening your web browser and going to google.com. Packets are sent out and come back in through the same pinhole. This is why you don't have to forward port 80 to establish an HTTP connection and why it is not needed for Vonage.

However, because your firewall is doing something based upon the SIP protocol, there is nothing Vonage can do to assist you. Should you choose not to completely disable the firewall, the service will not work.

I have been with Vonage for 6 years and am one of the approvers of placing the SBG-900 and SBG-1000 on the problem hardware list and making the only workaround disabling the firewall. This has come from seeing numerous customers over the years run into the same issue when using these modems. Even if by some mystery you were able to get it to register and get dial tone, in a few days, weeks, or months from now, something would trigger the firewall to start blocking SIP again leaving you without dial tone. In addition, the SBG series firewall will also cause no audio or 1 way audio conditions. I assume the difference in the customer experience is the firmware on the SBG modem.



Read The Full Thread:

RT31P2 behind an SBG900 Firewall, need to figure out ports.


I've just switched over to cable internet after having DSL for two years. My previous
The only way Vonage will work properly when used with any SBG series is to disable
Then help me to understand. I can have my xbox connect to the internet, send
Contrary to popular belief, enabling port forwarding or DMZ does not bypass the

VonTechMgr posted "It has nothing to do with the port. The source port of your device for the SIP protocol" on 03/04/2009

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