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Solutions Many users want Voicemail. Many vendors want to provide it. Two class of solutions: History: proxies that retarget include some information about where and why they retargeted. Voicemail uses that to decide what to do. History-Info: Voicemail-URI: proxies figure out what service they want voicemail to provide and tell the voicemail to do that. INVITE sip:bob@um.example.com;target=bob;cause=486 SIP/2.0 |