VoIP
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SonicOS Enhanced 4.0 Administrator Guide
SIP
SonicOS provides the following support for SIP:
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Base SIP standard (both RFC 2543 and RFC 3261)
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SIP INFO method (RFC 2976)
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Reliability of provisional responses in SIP (RFC 3262)
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SIP specific event notification (RFC 3265)
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SIP UPDATE method (RFC 3311)
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DHCP option for SIP servers (RFC 3361)
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SIP extension for instant messaging (RFC 3428)
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SIP REFER method (RFC 3515)
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Extension to SIP for symmetric response routing (RFC 3581)