I have setup a FreeSWITCH system using OpenZAP and Redfone>foneBridge2 for my connection to the PSTN and there seems to be a 3-5 second delay between when the incoming call is answered and the parties are able to hear each other.  This is only with inbound calls, outbound audio connection is instant. 

 

Any suggestions on where to start troubleshooting this issue?