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"Session Initiation Protocol (SIP) URIs for Applications such as Voicemail ..."
Cullen Jennings, François Audet, John Elwell (2006)
- Cullen Jennings, François Audet, John Elwell:
Session Initiation Protocol (SIP) URIs for Applications such as Voicemail and Interactive Voice Response (IVR). RFC 4458: 1-21 (2006)

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