Hi Raj,
You need to modify SDP to inform others about what you like to send and receive. Here is an example of a user who wants to receive audio and video only. The user will not send any audio and video.
// Since the "remote" side has no media stream we need
// to pass in the right constraints in order for it to
// accept the incoming offer of audio and video.
var sdpConstraints = {'mandatory': { 'OfferToReceiveAudio':true, 'OfferToReceiveVideo':true, 'maxWidth': 1920, 'maxHeight': 1080 }};
Thanks,
Shakeeb