A Ground Button (Recall Button) lets you place a call on Consultation Hold and return to dial tone so that you can invoke station features. The Ground Button provides an alternative method of producing a Switchhook Flash.
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Enter the following parameters:
Flash Type: Normal
Minimum Flash Timer: 160 ms
Maximum Flash Timer: 160 ms
Ground Button: Yes.
2500 model telephones
To generate a flash during a call:
Press Ground Button.