Merge "Update the description of startImsTraffic"

     * shall be prioritized to the subscription which handles higher priority service.

     * When both subscriptions are handling the same type of service then RF shall be

     * prioritized to the voice preferred sub.

     *  3. To evaluate the overall access barring in the case of ACB, ACB-Skp/SCM,

     * SSAC and UAC. If the specific failure including network access, modem

     * internal and RF resource prioritization from the modem happen,

     * {@link IRadioImsResponse#startImsTrafficResponse()} or

     * {@link IRadioImsIndication#onConnectionSetupFailure()} shall be invoked with the

     * failure reason.

     *  3. To evaluate the overall access barring in the case of ACB, ACB-Skp/SCM and UAC.

     * The response {@link IRadioImsResponse#startImsTrafficResponse()} with success shall

     * be sent by modem upon access class is allowed and RF resource is allotted. Otherwise

     * the same API shall be invoked with appropriate {@link ConnectionFailureInfo}. Further

     * if RRC connection setup fails then {@link IRadioImsIndication#onConnectionSetupFailure()}

     * shall be invoked by modem with appropriate {@link ConnectionFailureInfo}.

     *

     * @param serial Serial number of request

     * @param token A nonce to identify the request