- Call-Processing Language
Call Processing Language (CPL) is a language that can be used to describe and control
Internet telephonyservices. It is designed to be implementable on either network serversor user agentservers. 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.
In Case of Session Initiation Protocol Servers(SIP servers),it can be used to specify theuser 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 actionetc....etc...
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