Calls getting disconnected from freePBX

Hello all,

I’m having a problem that when I’m on a call the call gets dropped. It seems to be that the connection between the sip phone and the freePBX is getting broken. When I hear the call get dropped I look at the panel and it shows the call is still connected until the other party hangs up. I have had it where I have had a dropped call and then dial in the voice mail and I get voice mail and also I get reconnected to the call at the same time.

I have replaced the Digium TDP400 card that I’m using as that was a thought. I have three different phones that this is happening with. There is no consistent timing on how long the call will last before it is dropped. I have tested and taken a new switch and connected only one phone to the FreePBX box and the same thing is still happening. I have replaced the NIC in the system as well.

Any ideas please.