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 direct.telecom.co.nz 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 internet.telecom.co.nz. 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?

Cheers,
Gavin.