Whether this object accurately describes the capabilities of a
particular contact, or if it's only a guess based on the capabilities of the underlying connection.
If the
contact_specific property is true, this
function checks if the contact associated with this Capabilities supports D-Bus tubes with
handle_type as TargetHandleType.
If the
contact_specific property is false, this
function checks if SMS text channels can be requested with the connection associated with this Capabilities
.
If the
contact_specific property is true, this
function checks if the contact associated with this Capabilities supports stream tubes with
handle_type as TargetHandleType.