[SIPForum-discussion] Scenario of SIP

[nitin kapoor]

Vijay,

Yes in sip scenario we call them early media. Normally early media refers to
media (e.g., audio and video) that is exchanged
before a particular session is accepted by the called user. Within a dialog,
early media occurs from the moment the initial INVITE is sent until the User
Agent Server (UAS) generates a final response. It may be unidirectional or
bidirectional, and can be generated by the caller, the callee, or both.
Typical examples of early media generated by the callee are ringing tone and
announcements (e.g.,
queuing status). Early media generated by the caller typically consists of
voice commands or dual tone multi-frequency (DTMF) tones to drive
interactive voice response (IVR) systems.

Thanks,
Nitin Kapoor



2009/8/23 vijay pal <vijaypal85 at gmail.com>

> Hi All,
>
> These days we are using a function in our  mobiles like Verizon mobile and
> that is a IVR"While your call is being connected please listen the music".
> So my question is what is this type of media? Is it early media or some
> thing else? and if it is early media then how can it be before the session
> establishment, I mean to say  before 183(session progress)?
> Please help me to understand this Scenario.
>
>
> Thanks and Regards
> Vijay Pal
>
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