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Its basically Used to transfer information that does not change the status of the call. (RFC 2976)
Used by SS7 networks to deliver ISDN User messages

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Posted by HamidAliKhan

INFO:
Carries session-related control information that is generated during a session, as specified in RFC 2976 (The SIP INFO Method).
http://www.ietf.or/rfc/rfc2976.txt?number=2976

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Posted by sagitraz

INFO- Used to transfer information that does not change the status of the call. (RFC 2976)
Used by SS7 networks to deliver ISDN User messages.

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Posted by kwwilliams