In the absence of any documentation on the Grandstream HT-502, I would assume this is something that needs to be configured within your ATA. It's my understanding that ATA's have web interfaces similar to ethernet routers for configuration purposes as well as a verbal touch-tone menu system for configuration via telephone keypad. Early on, I had a glitch with call waiting behaving more like 3-way calling (the caller on hold could listen in on, and probably participate in, a second incoming call) which was solved by making a configuration change within the ATA. I submitted a ticket regarding this issue and was given instructions to reconfigure the ATA via my telephone keypad. If you are using the ATA hardware provided by VOIPo, I would assume they can remotely access your ATA's web interface, since under the terms of service, VOIPo still owns the hardware they provided when your account was established.
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