RTC behind NAT non-UPNP

Hello all,

I'm developing a SIP softphone using RTC API 1.3. When I'm behind NAT non-UPNP,

I can't register to SIP Server. In RTC 1.5 for Windows CE, there seems to be a solution for this via the interface IProfilePortManagement, but in RTC 1.3 for WindowsXP, there isn't a simple straight solution such as that.

How can I register the IRTCProfile in SIP Server (Asterisk, OpenSER, etc) when using NAT non-UPNP ? Or ... how can I use STUN for registering profiles under RTC 1.3?

Thanks for anyone who can help!!!

 

Hi,
I know a webpage that talks about Softphones, also includes source codes, although i couldn't find the answer for your question there.
Maybe you will, so i share the link:
http://www.voip-sip-sdk.com/p_179-windows-forms-softphone-vb-net-voip.html