It is a feature of FreePBX or Asterisk. If FreePBX, where can I find info to make it work? I am currently using Asterisk 11
Its part of using End Point Manager along with Phone Apps and supported phones.
http://wiki.freepbx.org/pages/viewpage.action?pageId=19498060
It does support Grandstream telephones? Would it be a feature of a call center log-in procedure?
I am using grsndstream phones. Will it work with t8?
Sent from my Verizon Wireless 4G LTE smartphone
So Phone apps don’t support anything other then phones listed in this wiki page?
No Snom or Grandstream? 
Phone apps are supported on the devices listed at:
http://wiki.freepbx.org/display/FPG/RESTful+Phone+Apps-Supported+Devices
That’s unfortunate.
Thanks for the info.
If you would like a model or phone added you may open a feature request at http://issues.freepbx.org . If you would like a quote for custom development you can always contact our sales folks.
Ah that is actually great idea.
I will make a request.
Thank you for the advice, much appreciated.