Hello everyone I have a iPhone with Acrobits version 4.0 that supports multitasking. My 3CX is update to the last version. To enable multitasking in acrobits you have to switch your sip protocol from UDP to TCP. So i forwarded the TCP protocol port 5060 to my server. And acrobits logs in succesfully to my 3CX server. But i don't hear my audio anymore both ways. Is ther somting i have to configure in 3CX myself to support TCP Sip connections ?? Here is a short discription how to use multitasking in Acrobits. I want to use option 2 because the battery lasts longer. http://www.acrobits.cz/tutorials/ios4-and-multitasking-on-groundwire-and-acrobits-softphone/ Can anyone help me with this ?? Thnx !