Wireshark · Display Filter Reference: ISDN Q.921-User Adaptation Layer

Field name	Description	Type	Versions
iua.asp_identifier	ASP identifier	Unsigned integer (32 bits)	1.0.0 to 4.4.2
iua.asp_reason	Reason	Unsigned integer (32 bits)	1.0.0 to 4.4.2
iua.diagnostic_information	Diagnostic information	Byte sequence	1.0.0 to 4.4.2
iua.dlci_gsm_sapi	SAPI	Unsigned integer (8 bits)	1.12.0 to 4.4.2
iua.dlci_one_bit	One bit	Boolean	1.0.0 to 4.4.2
iua.dlci_sapi	SAPI	Unsigned integer (8 bits)	1.0.0 to 4.4.2
iua.dlci_spare	Spare	Unsigned integer (16 bits)	1.0.0 to 4.4.2
iua.dlci_spare_bit	Spare bit	Boolean	1.0.0 to 4.4.2
iua.dlci_tei	TEI	Unsigned integer (8 bits)	1.0.0 to 4.4.2
iua.dlci_zero_bit	Zero bit	Boolean	1.0.0 to 4.4.2
iua.error_code	Error code	Unsigned integer (32 bits)	1.0.0 to 4.4.2
iua.heartbeat_data	Heartbeat data	Byte sequence	1.0.0 to 4.4.2
iua.info_string	Info string	Character string	1.0.0 to 4.4.2
iua.int_interface_identifier	Integer interface identifier	Unsigned integer (32 bits)	1.0.0 to 4.4.2
iua.interface_range_end	End	Unsigned integer (32 bits)	1.0.0 to 4.4.2
iua.interface_range_start	Start	Unsigned integer (32 bits)	1.0.0 to 4.4.2
iua.message_class	Message class	Unsigned integer (8 bits)	1.0.0 to 4.4.2
iua.message_length	Message length	Unsigned integer (32 bits)	1.0.0 to 4.4.2
iua.message_type	Message Type	Unsigned integer (8 bits)	1.0.0 to 4.4.2
iua.parameter_length	Parameter length	Unsigned integer (16 bits)	1.0.0 to 4.4.2
iua.parameter_padding	Parameter padding	Byte sequence	1.0.0 to 4.4.2
iua.parameter_tag	Parameter Tag	Unsigned integer (16 bits)	1.0.0 to 4.4.2
iua.parameter_value	Parameter value	Byte sequence	1.0.0 to 4.4.2
iua.release_reason	Reason	Unsigned integer (32 bits)	1.0.0 to 4.4.2
iua.reserved	Reserved	Unsigned integer (8 bits)	1.0.0 to 4.4.2
iua.status_identification	Status identification	Unsigned integer (16 bits)	1.0.0 to 4.4.2
iua.status_type	Status type	Unsigned integer (16 bits)	1.0.0 to 4.4.2
iua.tei_status	TEI status	Unsigned integer (32 bits)	1.0.0 to 4.4.2
iua.text_interface_identifier	Text interface identifier	Character string	1.0.0 to 4.4.2
iua.traffic_mode_type	Traffic mode type	Unsigned integer (32 bits)	1.0.0 to 4.4.2
iua.version	Version	Unsigned integer (8 bits)	1.0.0 to 4.4.2