$this->hasColumn('direction',    'string', 16);
		enum('Inbound', 'Outbound', 'Internal'), 1 byte
$this->hasColumn('hangup_cause', 'string', 32);
		enum('ACCESS_INFO_DISCARDED', 'ALLOTTED_TIMEOUT', 'ATTENDED_TRANSFER', 'BEARERCAPABILITY_NOTAUTH', 'BEARERCAPABILITY_NOTAVAIL', 'BEARERCAPABILITY_NOTIMPL', 'BLIND_TRANSFER', 'CALL_AWARDED_DELIVERED', 'CALL_REJECTED', 'CHANNEL_UNACCEPTABLE', 'CHAN_NOT_IMPLEMENTED', 'CRASH', 'DESTINATION_OUT_OF_ORDER', 'EXCHANGE_ROUTING_ERROR', 'FACILITY_NOT_IMPLEMENTED', 'FACILITY_NOT_SUBSCRIBED', 'FACILITY_REJECTED', 'IE_NONEXIST', 'INCOMING_CALL_BARRED', 'INCOMPATIBLE_DESTINATION', 'INTERWORKING', 'INVALID_CALL_REFERENCE', 'INVALID_IE_CONTENTS', 'INVALID_MSG_UNSPECIFIED', 'INVALID_NUMBER_FORMAT', 'LOSE_RACE', 'MANAGER_REQUEST', 'MANDATORY_IE_LENGTH_ERROR', 'MANDATORY_IE_MISSING', 'MEDIA_TIMEOUT', 'MESSAGE_TYPE_NONEXIST', 'NETWORK_OUT_OF_ORDER', 'NORMAL_CIRCUIT_CONGESTION', 'NORMAL_CLEARING', 'NORMAL_TEMPORARY_FAILURE', 'NORMAL_UNSPECIFIED', 'NO_ANSWER', 'NO_ROUTE_DESTINATION', 'NO_ROUTE_TRANSIT_NET', 'NO_USER_RESPONSE', 'NUMBER_CHANGED', 'ORIGINATOR_CANCEL', 'OUTGOING_CALL_BARRED', 'PICKED_OFF', 'PRE_EMPTED', 'PROGRESS_TIMEOUT', 'PROTOCOL_ERROR', 'RECOVERY_ON_TIMER_EXPIRE', 'REDIRECTION_TO_NEW_DESTINATION', 'REQUESTED_CHAN_UNAVAIL', 'RESPONSE_TO_STATUS_ENQUIRY', 'SERVICE_NOT_IMPLEMENTED', 'SERVICE_UNAVAILABLE', 'SUBSCRIBER_ABSENT', 'SWITCH_CONGESTION', 'SYSTEM_SHUTDOWN', 'UNALLOCATED_NUMBER', 'UNSPECIFIED', 'USER_BUSY', 'USER_CHALLENGE', 'USER_NOT_REGISTERED', 'WRONG_CALL_STATE', 'WRONG_MESSAGE'), 1 byte
$this->hasColumn('network_addr', 'string', 16);
		integer, 4 bytes, use PHP ip2long() or MySQL INET_ATON()
$this->hasColumn('progress_time','string', 15);
		integer, 4 bytes, unsigned
$this->hasColumn('progress_media_time', 'string', 15);
		integer, 4 bytes, unsigned
$this->hasColumn('hangup_time',  'string', 15);
		integer, 4 bytes, unsigned
$this->hasColumn('local_media_ip', 'string', 16);
		integer, 4 bytes, unsigned
$this->hasColumn('remote_media_ip', 'string', 16);
		integer, 4 bytes, unsigned
$this->hasColumn('ring_start_time', 'string', 15);
		integer, 4 bytes, unsigned
$this->hasColumn('total_ring_time', 'string', 15);
		small integer, 2 bytes, unsigned
$this->hasColumn('total_talk_time', 'string', 15);
		small integer, 2 bytes, unsigned