[abumelle]

I recently installed 3CX but calls drop after exactly 30sec. I had the same problem with X-lite thats why i changed to 3CX. On my old laptop (XP) things go smoothly, but on the newone (vista) all outward calls get cut off after 30 secs.
Help!

[mfm]

Hi,

Calls dropping after 30 seconds most of the time result in one having NAT issues, when a call is made the server sends "ok SDP" whereby the entity on the other end of the line must respond with "ACK " if it does not receive it, it will drop the call after 30 seconds. Please collect the output of the firewall checker and post it. What router are you using?

[abumelle]

Problem solved.
Changed router/modem from Thomson Speedtouch 716 to Fritzbox and that seems to be a good enough solution. Thanks.

[craigm]

I have the same problem. What is the best course of ation to try and resolve the issue?

I have checked the log and it say ACK not recived.

I am using a Sky router. To try and resolve the issue I have set the DMZ to the IP address of the 3CX server

[mfm]

HI,

Make sure the router has no SIP helpers on, they rarely help. I have no experience with a sky router, so im not sure how well they work in terms of SIP messaging.

[abumelle]

Try one of the solutions provided in the Xlite forum: http://forums.counterpath.com/viewtopic.php?f=6&t=15340&p=59160&hilit=+drop#p59160
Or change your modem.
Mine performed ok for two years, but suddenly started breaking of conversations after exactly 30 secs.

[craigm]

Thanks for the suggestion. I am unable to change me ADSL router as the service provider will not provide me with the user name and password that I require to log onto the ADSL account.

[craigm]

OK I have managed to resolve the issue.

The server has 2 Nics. I had dedicated one to be used by 3CX. As soon as I disabled the second nic and restared the the 3CX service all is fine.

I hope this helps other users that are having the same problem.

But it dose lead to so concerns