[Sip] How do we adress this SDP issue in SIP

[avinashkoneru <avinashkoneru at huawei.com>]

To SIP & SDP experts,

 

                               Iam having some doubts in RFC4566 (i.e SDP)could you please explain them briefly

 

RFC 4566 PAGE 14

 

Hierarchical or layered encoding schemes are data streams where the encoding from a single media source is split into a number of layers.

 

As per my understanding the above line says that  (Trade off between bandwidth and quality )

Ex : I have a media file of 1 GB size .If I use layered encoding that 1 GB media file could be made into 700k size with some loss of date  or 500k  size or 1GB only as per users choice?

 

Such layered encodings are normally transmitted in multiple multicast groups to allow multicast pruning

 

How would I know which layer is mapped to which multicast address (and size of each layer)?..

 

I think this issue is addressed by the protocol above SDP (i.e in SIP or SAP)?.. Could  anyone plz let me know .How and where this issue is addressed

 

 

 

Thanks and Regards,

Avinash Koneru

 

 

 

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