Call-Processing Language

From Wikipedia, the free encyclopedia

 All or part of this article may be confusing or unclear.
Please help clarify the article. Suggestions may be on the talk page. (May 2007)

Call Processing Language (CPL) is a language that can be used to describe and control Internet telephony services. It is designed to be implementable on either network servers or user agent servers. It is meant to be simple, extensible, easily edited by graphical clients, and independent of operating system or signaling protocol. It is suitable for running on a server where users may not be allowed to execute arbitrary programs, as it has no variables, loops, or ability to run external programs.

[edit] Sources

In Case of Session Initiation Protocol Servers(SIP servers),it can be used to specify the user defined preferences like (please refer to the rfc3880 for further details)

1)Authenticate calls To And From The user

 based on

     Address Info     -callerid
                      -domain of caller
                      -domain of callee
                      -display name of caller/callee
      
     DateTime of call
                     
                      -day of call
                      -hour of call
                      -minute of call
                      -year of call
            
     language preferences
   
     priority over subscribed numbers

2) modification of user locations in server through UI

3) Call routing logic

                    -how long to ring a phone
                     before doing further action
                     based on the result of the call
                    
                      like --busy
                           --noanswer
                           --notfound
                      and then take appropriate
                      action

etc.... etc...