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651 posts

Ultimate Geek

# 180748 20-Sep-2015 21:08
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I was just wondering if someone could point my in a direction I'm possibly overlooking to get VoIP over Spark 3G to work.

I'm using 2talk, with all codecs available and I'm able to initiate outbound calls from Linphone and Micrsip both on my Spark 3G mobile and via a Hewlett Packard laptop with 3G built in (also using a Spark SIM). Both use a different SIP account, one an 028 the other a regional local number.

My problem I've ran in to is that I can't receive calls. I've tried turning the firewall off on the laptop and on my phone without any success (after I tried setting up port forwarding with no success).

I also switched the laptop and mobile to and I got an IP in the 115.x.x.x range instead of the NAT'd 100.x.x.x range that I was getting on Unfortunately still no success.

I'm able to switch to Wi-Fi and enable the Windows firewall on the laptop or switch to Wi-Fi on my mobile and I'm able to receive VoIP calls and still place them.

It's just when I switch to 3G I can not get an incoming call. My phone is set to receive as well as place calls. The laptop using MicroSIP and Linphone registers too but still doesn't receive calls. Both can make outbound calls.

Anyone else had a successful experience with 2talk over Spark 3G?


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Mr Snotty
8942 posts

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  # 1390775 20-Sep-2015 21:25
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I've tried it before (on both 2degrees and Spark) and it works just OK. I've found you have to use 2talks STUN server to make it work properly and you should never use on a mobile device (as both inbound and outbound traffic gets counted, if you get a flood of traffic go inbound to your device you can kiss goodbye to your data).

I've given up on this now and am on Skinny's $46 plan giving me unlimited minutes. Another way you can do it is to purchase a Skype local number and use that. I've found Skype to be pretty reliable even on mobile data. 

651 posts

Ultimate Geek

  # 1390784 20-Sep-2015 21:37
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Yeah I thought about Skype local. Do they have a good range of numbers outside major metro areas?

I tried a stun server but no go in both apps.

I'll keep trying to figure out what I'm missing, or I may end up trying it on another network and see what happens. I'm pretty sure I'm not missing anything but if you've used it before sounds like I am missing something.

Yeah I realise all data counts. I'm not to worried about that as the laptop 3G service is only switched on occasionally, hopefully for a regional VoIP account.

My plan is to have someone call forward a local number to the VoIP local number when I need people to call in to a remote location without them incurring a toll call. I could just go toll free but I don't quite need that.


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  # 1390791 20-Sep-2015 22:02
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Spark has a ALG for sip traffic but YMMV as inbound NATed udp is a problematic beast.

If you can flick over to sip over TCP rather than UDP you will find the experience much better. Haven't tried 2talk or WXC but run my own asterisk and had reasonable success with my tests but nothing in anger.


651 posts

Ultimate Geek

  # 1390799 20-Sep-2015 22:23
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Awesome smile

Switched to TCP and now everything works really well. Obviously my older desktop VoIP phone that only does UDP is not going to be of great use to me so it can stay in the cupboard.

However TCP works on my Andriod phone (jellybean) and now in MicroSIP both over 3G.

I'm doing some remote voice work and being able to call forward to a local/regional number is priceless when my remote studio only has naked BB and I'm in a different region.

Cheers much.


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Biddle Corp
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  # 1390876 21-Sep-2015 08:07
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SIP using UDP hasn't worked from day 1 of the XT network. There are numerous existing threads on here discussing this.

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