said by RobThompson:
Do the SIP phones that you are talking about provide a better quality experience?
Yes. SIP hard phones like those from Polycom, snom, Gigaset, Grandstream, Yealink et al are fundamentally different from a soft phone client running on a smart phone.
Since they are not reliant upon wifi or 3G/4G networks that can be much more reliable that any kind of soft phone on a smart phone.
I have a Galaxy Nexus running Bria Android edition & Skype. Also a Nexus 7 table running Bria for Android Tablet Edition and Skype. My experience with these combinations has been a mixed bag. It can be good. It can just as easily be dreadful. It's no so much about the software, wireless IP networks are just like that.
In marked contrast I have Polycom VVX series phones in my home office and Gigaset SIP/DECT cordless phones in my home. These are absolutely reliable. They work and they sound great.--