twinkle and voipstunt

[Marco Mandl]

Hello,

I can't get twinkle to work. I want to use my voipstunt account but it
does not register successfully: "Registration failed: 500 Internal server
error"

I opened the ports 5060 and 8000-8005 on the NAT firewall.

domain: voipstunt.com
registrar: sip.voipstunt.com
outbound-proxy: sip.voipstunt.com
NAT stun: stun.voipstunt.com

Has somebody got twinkle working with voipstunt or a similar service?

Is the firewall the cause?

Regards,
Marco