Hi I have a couple of questions related to service logic creation and sip extension drafts a) Are there provisions by which the existing SIP stack can be extended to support the extension drafts that IETF comes up with.In other words,are there APIs by which new messages/headers/content types canbe created in existing SIP entities without coming out with a new version of the same.Pls illustrate with an example b) Service logic creation tools such as CPL etc can provide service creation by looking into existing messages etc.What happens when an extension comes up that introduces a new message/header etc that might have to be used to create a new service.Is there a provision to handle this relationship between scripting languages etc and new extensions to the protocol.eg How do I create a new service using instant messaging with CPL which I don't think understands SUBSCRIBE/NOTIFY messages c) Is there any draft for service creation in 3g networks Thanks Aditi
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