call establishing but not getting voice

[subbarao]

1. Brekeke Product Name and version:2.0.7.2

2. Java version:Jdk 1.5.0

3. OS type and the version:LInux

4. UA (phone), gateway or other hardware/software involved:Phoner

5. Select your network pattern from http://www.brekeke-sip.com/bbs/network/ ... terns.html :Pattern4

6. Your problem:call is establishing between two user agents but not getting any voice.Plz tell me the resolution.IF any resolve the
problem i will be happy.