Can a SIP IP Phone work if on Internet not LAN port

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walkerr:
I followed these instructions to try and get my Gigaset N300A to work as a client of the Obi 202:

http://blog.obihai.com/2012/08/use-your-obi202-as-google-voice-gateway.html

After some headscratching, I realised the Gigaset is on my house LAN and is on the Internet segment, not the LAN segment of the Obi. Since the Gigaset is used to manage both POTS and other VoIp services, I'm loathe to move it to the LAN port and lose the direct management and access of these other VoIp services from the Gigaset, and easy control of service to handset mapping.

Is there any variation on the above article than can be made to work for a SIP gateway in the Internet side of the Obi?

QBZappy:
walkerr,

Welcome.

Did you try port forwarding the service ports of the OBi to the OBi ip, or perhaps as an alternative strategy put the Gigaset inside the Lan and port forward those service ports?

walkerr:
Not being a huge expert with routers or VoIP I hadn't considered either of those.

I'm not really sold on connecting my Gigaset via the Obi. It serves both my house and home office voip and POTs lines, and is working very well. I'm loathe to disrupt that TBH, especially in a way I'll probably never remember/figure out how I did it later when things don't work.

How would port forwarding work in any other case - I understand the concept, but with nothing attached to the LAN connection on the Obi, what is being forward to where?

QBZappy:
walkerr,

No need to connect Gigaset via the Obi202 router. You need to describe your topology. Do you control your router?

walkerr:
At the moment it's a very conventional setup:

ISP <- ADSL -> Draytek Router <- My LAN ->

The Obi202 and the Gigaset N300 are both connected to "My LAN". I have full control over both.

What I read in the Obi202 for setting up a proxy so the Obi can be a SIP server to a Cisco IP phone sounded pretty close, but in that example the SIP phone had to go into the "Obi LAN" port.

The port forwarding makes sense - just not 100% sure which ports, and also struggling a bit to get my head around how port forwarding actually works if there is nothing connected to the "Obi LAN" ethernet connection. I guess that's the point right, something coming in on port 5060 on the "Obi INTERNET" ethernet slot, gets port forward internally to the "Obi LAN" ethernet slot and magically appears as if it arrived from that subnet even though nothing is actually attached to it?

Up to his point, I thought I understood port forwarding - I guess I didn't ;)

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