[Freeswitch-users] Interoperability - Grandstream Phones (GXP2130)

Hello I recently purchased a Grandstream Phone for test with FreeSWITCH. Registration works fine. But I have couple of issues with this phone and switch. 1. Calls made from this phone never hangup properly (either internal or external) 2. Audio breaks every one or two minute. Sometime silent. Any suggestions? Thank you Lloyd