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Using Both?
Perhaps the long discussion was caused because there are two basic mechanisms; we need and both can be used for an application called “voicemail”
Proxy can add retargets and also may use voicemail URI or it can just do one of these
Voicemail can use URI for basic information and look at History for advanced services
Information in two headers does not conflict
These do not cause harm or restrict what is possible. Many people want to use them.
PPT Version