A method performed by a first communication device, for preparing a point-to-point, Pt2Pt, session with a second communication device is provided. The first communication device receives (202) from the second communication device, information about one or more communication protocol stacks that are supported by the second communication device for use in the Pt2Pt session. The first communication device obtains (208) a first communication protocol stack that is compatible with at least one out of the one or more protocol stacks that are supported by the second communication device. The first communication protocol stack will be used in the Pt2Pt session with the second communication device. The first communication device then re-configures (209) the first communication device to use the first communication protocol stack in the Pt2Pt session, and sends (210) a message to the second communication device. The message comprises information about said compatible first communication protocol stack which is to be used in the Pt2Pt session.