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Register a new callback to the qos. Meaning of the parameters is as follows: struct qos_ctx_st* qos - qos to register callback to. If maybe NULL only for QOSCB_CREATED callback type, which is not a per qos type. int type - types of callbacks; more types may be register for the same callback function; only QOSCB_CREATED must be register alone. Possible types: QOSCB_CREATED - called when a new qos context is created - it's a global type (not associated to any qos). QOSCB_ADD_SDP - called when a new SDP was added to the qos context - it's a per qos type. QOSCB_UPDATE_SDP - called when an existing SDP is updated - it's a per qos type. QOSCB_REMOVE_SDP - called when an existing SDP is removed - it's a per qos type. QOSCB_TERMINATED - called when the qos is terminated. qos_cb cb - callback function to be called. Prototype is: void (qos_cb) (struct qos_ctx_st *qos, int type, struct qos_cb_params *params); void *param - parameter to be passed to the callback function.