IAX Calls

Guyz help!

I setup idefisk as my softphone. I am encountering a problem regarding making calls to other computer using idefisk.

Here is my scenario:
I setup 2 client pc using idefisk
computer1: 1000
computer2: 1001

computer1 calls computer2

computer2 answered the incoming call from computer1

computer1 hears the voice coming from computer2 and the problem is, computer1 is still ringing but can already hear the voice from computer2.

computer2 cannot hear anything from computer1.

**Weird thing is that sometimes i can make calls work properly, and sometimes the problem above occurs…

Guyz hope you could help me with this problem.