> Normally, In case of SIP signaling, hold and retrieve 
> indication is carried in the signaling messages, in the 
> SDP carried by the SIP INVITE or UPDATE messages .
> 
> Can i have some detailed description about the attributes 
> part i.e a=sendrecv , inactive ,recvonly ,etc.......

See the following link for attribute references.

http://www.iana.org/assignments/sdp-parameters


Some offer/answer details are within rfc3264 and rfc6157.


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