Using a "unique" SIP port for each phone is fine. Lots of people do that for various reasons, one of which is, naturally, busting through NAT. FS doesn't really care what SIP port the device is using as long as it knows where to send the SIP traffic. -MC On Thu, Dec 20, 2012 at 9:47 AM, Sean Devoy <sdevoy@bizfocused.com> wrote:

Hi,****

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Since several people have suggested to avoid SIP ALG at all costs, I have disabled it and banged my head some more! Without SIP ALG, only one of my Polycom 335s can Register. The other 5 fail. (With SIP ALG they all register fine).****

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Now I have found that changing:****

*SETTINGS>SIP>LOCAL SIP PORT>* to a UNIQUE port (5066 in this case)****

And****

*SETTINGS>NETWORK>NAT>SIGNALING PORT>* to the same UNIQUE port****

I got a second phone to REGISTER and exchange calls!****

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When I say unique port, I mean unique to all the phones on this NAT Router. ****

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My question is “Is that fine?”****

I just want to know if there are limitations on the SIP Port number? Are there issues I should watch out for.****

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Thanks,****

Sean****

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