BLF on Call Waiting

[mahables]

I'm using a Grandstream gxp2010. The BLF feature shows the following states:
Green = no one is on the phone
Solid Red = someon is on the phone
Blinking Red = phone is ringing

How can I get the BLF to remain solid red a call comes in on an extension while the person at that extension is on the phone (call waiting)?

There should really be four different states:
Green = idle
Amber = ringing
Red = on the phone
Blinking Red = on the phone and getting a call (call waiting)

Right now, if someone is on the phone and a call comes into their extension, the blf light blinks red. So, if I glance at my phone after their extension started ringing, I don't know if they are on the phone while their phone is ringing or if they are just picking their nose while they watch the phone ring.

I hope there is a way to do this.

 

[mahables]

notifyringing

Since in my particular situation I don't need to see when an extension is ringing, I thought that perhaps I could disable the hint when an extension is ringing. So, I tried to add "notifyringing=no" to the sip_general_custom.conf file, and had no luck.