NEC’s UNIVERGE ST450 and ST465 softphones for Apple and Android smartphones allows them to make and receive calls from virtually anywhere, as if they were at their desk. While in the office connect to the Wi-Fi and they are ready to make and receive calls. While outside the office they can use their mobile data (3G / 4G) to handle their calls without incurring mobile call costs (requires VPN or a Session Border Controller).
Deploying a ST softphone can save a company money by no longer having employees call-forward their desk phones to their mobile. Staff will also be able to make free internal calls and inexpensive local calls from the mobile client rather than all calls being made directly from their mobile phone.
By only giving out your desk phone number (not your mobile number), you will always be contactable and you will only have a single call history and work voicemail to check.
To find out more you can visit the ST400 page on the SV9000 series microsite. http://sv9000.nec.com.au/Phones/ST400-Softphone.html