Just an update:

I changed the System IO DNS back to 8.8.8.8 & 4.4.2.2, it still goes to sleep but it's now stable with my Galaxy note 5.

The other problem now is the customer has an iPhone and they can register and make calls but there is No audio both ways but it's working fine on my Android.

From reading other posts, I turned MPS off and had the customer disable SIP ALG with no change.

The IPhone could make calls with full audio before I loaded the new SIP trunk license and before I programmed the mobex portion per the WE VOIP configuration guide. ( the customer doesn't have the SIP TRUNKS yet so it's set for deactivated)