Signalling assymetric media capabilities

A method for signalling asymmetric media capabilities using session description protocol (SDP) signalling, the method being performed by a second electronic device and comprising:

• receiving a first SDP message comprising an SDP offer from a first electronic device, wherein the SDP offer comprises media descriptions for at least one media stream, the media descriptions being based on media capabilities for at least one of sending media streams and receiving media streams by the first electronic device, wherein at least one media stream in the SDP offer is represented by at least two media descriptions, the at least two media descriptions representing asymmetric media capabilities in relation to each other;
• generating an SDP answer from the SDP offer by disabling at least one media description in the SDP offer for at least one of the at least one media streams;
• and
• sending a second SDP message comprising the SDP answer to the first electronic device.

An electronic device for signalling asymmetric media capabilities using session description protocol (SDP) signalling, the electronic device comprising a processing unit, the processing unit being arranged to:

• acquire media capabilities for at least one of sending media streams and receiving media streams by the electronic device;
• generate an SDP offer comprising media descriptions for at least one media stream based on the acquired media capabilities, wherein at least one media stream in the SDP offer is represented by at least two media descriptions, the at least two media descriptions representing asymmetric media capabilities in relation to each other;
• and
• send a first SDP message comprising the generated SDP offer to a second electronic device.

An electronic device for signalling asymmetric media capabilities using session description protocol (SDP) signalling, the electronic device comprising a processing unit, the processing unit being arranged to:

• receive a first SDP message comprising an SDP offer from a first electronic device, wherein the SDP offer comprises media descriptions for at least one media stream, the media descriptions being based on media capabilities for at least one of sending media streams and receiving media streams by the first electronic device, wherein at least one media stream in the SDP offer is represented by at least two media descriptions, the at least two media descriptions representing asymmetric media capabilities in relation to each other;
• generate an SDP answer from the SDP offer by disabling at least one media description in the SDP offer for at least one of the at least one media streams;
• and
• send a second SDP message comprising the SDP answer to the first electronic device.