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22 posts


Topic # 230387 21-Feb-2018 22:04
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I've been on skinny broadband for a while now and had set up a 2talk phone line to trial.


All was going swimmingly - so i thought, until Monday when I took the plunge and had my landline ported across and fully committed to cutting the POTS cable.


(Although I'm using a skinny broadband connection, I have no coverage at home for cell phones so having a landline is still pretty important) 


Despite what I thought was some robust field testing, my voip line is pretty much non functioning. It "mostly" registers and I can "mostly" make outgoing calls, but incoming is not working about 95% of the time.


I've got 2 voip phones, a grandstream DP750, a polycom soundpoint 335 - I also installed the 2talk softphone on my mobile - same problems across them all.


I've read almost every post on the double NAT problem, and various settings use to make them work - with no success.


The softphone works 100% when I'm at work on a single NAT'ed ADSL connection, but not at home - so I convinced it's something to do with skinny broadband offering - maybe the awful huawei router.


I've pretty much given up on trying to make the phones work and was thinking the a VPN connection to an external VPN provider might be my only hope. (I really, really don't want to admit defeat and beg Spark for my landline back)


I'd love to hear if anyone has a working solution here. 









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155 posts

Master Geek
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  Reply # 1961888 21-Feb-2018 22:07
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Try changing your SIP registration port from 5060 to 50600 to avoid the NAT SIP ALG (2talk's servers listen on both ports for this specific workaround).


No guarantees, but it works fine that way on a 2talk/Skinny-4G setup I've done at my inlaws.

22 posts


  Reply # 2062809 26-Jul-2018 09:59
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Some five months later i can report that the grandstream has been working 100% on port 50600.


The Polycom handset would not work despite trying multiple firmware versions - I've given up on that one.







155 posts

Master Geek
+1 received by user: 51

  Reply # 2062810 26-Jul-2018 10:05
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Cool, that's great news :)


Just to be clear, it's not double-NAT that the port 50060 trick is 'fixing', it's the broken SIP ALG in one (or both?) or the NAT implementations.


Moving the traffic from port 5060 to 50060 simply causes the ALG to ignore it.



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