User Guide for the SIP-T28P IP Phone 
4 
A call cannot be recorded 
Recording starts successfully 
Recording cannot be started 
Recording cannot be stopped 
Power Indicator LED (Hardware version must be 1.0.0.2 or higher) 
The phone is initializing. 
The phone is busy. 
The phone is idle. 
The call is placed on hold or is held. 
The phone receives a text message or voice mail. 
Fast flashing green (300ms) 
The phone is ringing. 
The call is muted. 
The phone is powered off.