WE VOIP (Wireless Enterprice Voice over IP) is the new samsung mobile client.

It requires 4.70 software and a license.
It uses a combination of SIP phone and MOBEX standard todo various features.
connectivity is either via wireless (don't use SMT-R2000 ap's they have handover issues (using just 1 is ok), there is a new enterprise wireless system comming out) or 3g/4g

I don't know if it will be put on the app store or not.
I was sent the apk file to do the installation.
It was only just released down here along with the samsung xchange mobile client