           , (error) ->
             console.log("Error creating answer: ", error)
             console.log(peer)
-          )
+          ,sdpConstraints)
       ,(error) ->
         console.log("setRemoteDescription error: ", error)
       )

    console.log('config',config)
    if (config.sendOffer)
      console.log("Creating RTC offer to " + peer_id)
      peer_connection.createOffer((local_description) =>
        console.log("Local offer description is: " + local_description)
        peer_connection.setLocalDescription(local_description

        )
      , (error) ->
        console.log("Error sending offer: "+error)
      ,constraints)
    peer_connection

  mergeConstraints: (cons1, cons2) ->
    merged = cons1
    for name in cons2.mandatory
      merged.mandatory[name] = cons2.mandatory[name]
    merged.optional = merged.optional.concat(cons2.optional)
    merged


  # Peers exchange session descriptions which contains information
