Troubleshooting 
584 
 
Other Issues 
The difference among user name, register name and display name 
Both user name and register name are defined by the server. User name identifies the account, while 
register name matched with a password is for authentication purposes. Display name is the caller ID that 
will be displayed on the callee’s phone LCD screen. Server configurations may override the local ones. 
On code and off code 
They are codes that the IP phone sends to the server when a certain action takes place. On code is used 
to activate a feature on the server side, while off code is used to deactivate a feature on the server side. 
For example, if you set the Always Forward on code to be *78 (may vary on different servers), and the 
target number to be 201. When you enable Always Forward on the IP phone, the IP phone sends *78201 
to the server, and then the server will enable Always Forward feature on the server side, hence being able 
to get the right status of the extension. 
For anonymous call/anonymous call rejection feature, the phone will send either the on code or off code 
to the server according to the value of Send Anonymous Code/Send Rejection Code. 
The difference between RFC 2543 Hold enabled and disabled   
Capturing packets after you enable the RFC 2543 Hold feature. SDP media direction attributes (such as 
a=sendonly) per RFC 2543 is used in the INVITE message when placing a call on hold. 
 
Capturing packets after you disable the RFC 2543 Hold feature. SDP media connection address c=0.0.0.0 
per RFC 3264 is used in the INVITE message when placing a call on hold.