Detailed Product Description
Provide accurate reverse polarity billing signal    
Display Caller ID    
Add prefixed code automatically:  The telephone setting can be set up to add the local area code when dialing local fixed calls and add IP prefixed code when dialing long-distance calls.    
Locking wireless terminal, locking SIM card, locking service provider and locking districts.    
Network Management    
Parameter management: Parameters can be modified by hand via the connected telephone.    
Telephone code management: Barred telephone number and directly transmit telephone number    
Resume parameters: All the parameters can be set up to be the default status when it is necessary    
Set up or cancel call diverting    
Support PBX    
Adjusting the volume of voice: microphone volume and speaker volume can be adjusted separately.