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Taken from RFC

" Early Media is the ability of two SIP user agents to communicate

before a SIP call is actually established. Support for early media is

important largely for interoperability with the PSTN. Unfortunately,

many SIP devices are providing this capability today without a well-

documented, consistent, and complete solution. We define the problem

of early media, document and describe the difficulties with the

current approach used in SIP UAs, and present a more formal protocol

mechanism that resolves these difficulties."

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17y ago

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