Refer-To
An example of the header is shown below:
Refer-To: sip:conference1@example.com Refer-To: <sips:a8342043f@atlanta.example.com?Replaces=12345601%40atlanta.example.com%3bfrom-tag%3d314159%3bto-tag%3d1234567>
The header properties are shown in the following table:
| 
                                                             Header Level Action  | 
                                                        
                                                             Add  | 
                                                        
                                                             Delete  | 
                                                        
                                                             Modify  | 
                                                        
                                                             List Entries  | 
                                                    
|---|---|---|---|---|
| 
                                                             Operations Supported  | 
                                                        
                                                             Yes  | 
                                                        
                                                             Yes  | 
                                                        
                                                             No  | 
                                                        
                                                             N/A  | 
                                                    
| 
                                                             Keyword  | 
                                                        
                                                             Sub Types  | 
                                                        
                                                             Attributes  | 
                                                    
|---|---|---|
| 
                                                             N/A  | 
                                                        
                                                             N/A  | 
                                                        
                                                             N/A  | 
                                                    
Below are header manipulation examples:
| 
                                                             Example 1  | 
                                                        
                                                             Rule:  | 
                                                        
                                                             Add a basic header: 
 
 
 
  | 
                                                    ||||||||||||
| 
                                                             Result:  | 
                                                        Refer-To: <sip:referto@referto.com>  | 
                                                    |||||||||||||
| 
                                                             Example 2  | 
                                                        
                                                             Rule:  | 
                                                        
                                                             Add a Refer-To header with URI headers: 
 
 
 
  | 
                                                    ||||||||||||
| 
                                                             Result:  | 
                                                        Refer-To: <sips:a8342043f@atlanta.example.com?Replaces=12345601%40atlanta.example.com%3bfrom-tag%3d314159%3bto-tag%3d1234567>  |