Calls abort after 24 seconds

[pjmeulen]

We have an Vigor 2820 router and configured it with Qos like descriped in this article:
http://www.3cx.com/blog/voip-howto/draytek-firewall-voip/

Dos Defense is not activated.

Still all voip calls are aborted after 30 seconds.

I have disabled Stun server because one of my voip providers asked for that.
Is it therefore that my calls are aborted?

Where can i find how to make NAT mapping on the Vigor 2820

 

[mfm]

Hi,

It sounds like 3CX is not receiving the ACK. Your guess would be correct it is NAT issues.

http://portforward.com/english/routers/port_forwarding/Draytek/Vigor-2800G/3CX.htm

This is the closest router i could find to yours.

Best of luck!

 

[hornetsoft]

if your router support sip alg switch it off I have had this problem loads of times and its worked for me on several routers not sure if there are any other problems caused by switching it off

 

[hornetsoft]

Seems that you need to do this via telnet.

sys sip_alg ?

Should return the current status.

usage: sys sip_alg [value]
0 - disable SIP ALG
1 - enable SIP ALG