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8 posts

Wannabe Geek

Topic # 111155 25-Oct-2012 19:28 Send private message

Hi Guys, I hope I'm posting this in the right place? (maybe this belongs to Voip?) Anyway I bought a brand new Netcomm NB16WV about 2 months ago for the new flat cos we have the unlimited naked broadband plan with slingshot. I did all the setting up of the internet and Voip all fine and from initial testing of the voip, calling out and receiving calls all seemed to work no problem. A couple of weeks later my flatmates getting complaints from their parents cos our phone isn't working (ie when calling in there is an automated voice saying our number is not available) however we are still able to call out on the same line without fault. I have spoken to the technician support guy from slingshot and of the 80mins i was on the phone the only piece of relavant information I got was that there was no fault with voip service and it must be some hardware related problem. That was cool I just did a factory restore, modem setup and all was good with the world. Fast forward to last week, same thing happened again but this time rebooting the modem seemed to have fixed it again... for 2 days and it happened again and again... you get the idea.

Now my question is, has anyone come across this problem with voip in general before or with this particular modem? I've done some googling and came up empty. There so nothing suggesting this is a typical fault with voip unless my settings were wrong in which case it should of worked in the first place which lead me to think it is my modem that is faulty or something to the with the firmware?

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19611 posts

Uber Geek
+1 received by user: 1400

Biddle Corp

  Reply # 706499 25-Oct-2012 20:20 Send private message

Just because SIP is a standard doesn't mean every SIP device will work flawlessly with every SIP softswitch out there. The downside of opting for an ISP and VoIP provider that doesn't offer a full autoprovisioning deployment model is that you can't be certain that all the correct settings are in place, or that the device is fully compatible.

Having spent time testing Netcomm hardware for deployment over the last few months for data + VoIP I would not recommend it.

If you did want one thing to look at it would be the SIP registration period, depending on the SBC in use it could be too high and timing out which be a potential explanation for the issue.

8 posts

Wannabe Geek

  Reply # 706513 25-Oct-2012 20:51 Send private message

Thanks for the reply. I had a look at the settings again, there's a option to change my SIP expire time (I guess it's the registration period?), the default is 500s. Should I be setting this higher or lower so that it doesn't time out?

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Uber Geek
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Biddle Corp

  Reply # 706514 25-Oct-2012 20:55 Send private message

You would really need to establish what settings your VoIP provider recommends, based upon their SBC configuration.

862 posts

Ultimate Geek
+1 received by user: 31


  Reply # 706786 26-Oct-2012 11:35 Send private message


Have you forwarded ports for the Italk? This could help.


8 posts

Wannabe Geek

  Reply # 713818 7-Nov-2012 21:05 Send private message

Sorry for the late reply, I've been on holiday and just got back. Flatmates are still complaining its not working properly. I have forwarded the SIP port 5060 for both tcp and udp and no real difference.

I just swapped over the modem to my old Linksys WAG54GP2 (a better modem in my opinion) and it's still doing the same thing. Now heres the kicker, this modem worked with 0 problem in my old flat and the only reason I bought the netcomm was because the antenna on the linksys was loose after my move so the wifi wasn't going properly but I took it to work did a bit of soldering and have fixed this problem, all good.

So what else could be causing this issue? The only other factor that changed are: the house (obviously), a different landline number (the but the same slingshot account and same suburb in rotorua) and a different phone (tho both were cordless). If anyone can suggest solutions would be much appreciated. This is actually causing a bit of tension in the flat cause everyone else there have no technician knowledge and they have the mentality that electronics should just work... and somehow this is my fault because its my modem and my slingshot account...

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Uber Geek
+1 received by user: 323


  Reply # 713853 7-Nov-2012 21:51 Send private message

Netcomm have this awesome thing called 'SIP ALG'. It is awesome at breaking SIP. Find it and disable it for starters.
I've had some major troubles with Netcomm modem/routers. Their older NB6's were ok but on these newer ones they have tried to get fancy with firewalls that just end up screwing things up. You shouldn't have to port forward but you may need to get some rules in to the firewall to allow incoming connections on 5060.

Can Slingshot let you register on any other ports?

8 posts

Wannabe Geek

  Reply # 714263 8-Nov-2012 17:18 Send private message

Turned SIP ALG off before going away, didn't work.

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