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Manual Reference Pages  -  ECHOSCU (1)


echoscu - DICOM verification (C-ECHO) SCU



echoscu [options] peer port


The echoscu application implements a Service Class User (SCU) for the Verification SOP Class. It sends a DICOM C-ECHO message to a Service Class Provider (SCP) and waits for a response. The application can be used to verify basic DICOM connectivity.


peer hostname of DICOM peer

port tcp/ip port number of peer


    general options

-h --help print this help text and exit

--version print version information and exit

--arguments print expanded command line arguments

-q --quiet quiet mode, print no warnings and errors

-v --verbose verbose mode, print processing details

-d --debug debug mode, print debug information

-ll --log-level [l]evel: string constant (fatal, error, warn, info, debug, trace) use level l for the logger

-lc --log-config [f]ilename: string use config file f for the logger

    network options

application entity titles:

-aet --aetitle [a]etitle: string set my calling AE title (default: ECHOSCU)

-aec --call [a]etitle: string set called AE title of peer (default: ANY-SCP)

association negotiation debugging:

-pts --propose-ts [n]umber: integer (1..28) propose n transfer syntaxes

-ppc --propose-pc [n]umber: integer (1..128) propose n presentation contexts

other network options:

-to --timeout [s]econds: integer (default: unlimited) timeout for connection requests

-ta --acse-timeout [s]econds: integer (default: 30) timeout for ACSE messages

-td --dimse-timeout [s]econds: integer (default: unlimited) timeout for DIMSE messages

-pdu --max-pdu [n]umber of bytes: integer (4096..131072) set max receive pdu to n bytes (default: 16384)

--repeat [n]umber: integer repeat n times

--abort abort association instead of releasing it

    transport layer security (TLS) options

transport protocol stack:

-tls --disable-tls use normal TCP/IP connection (default)

+tls --enable-tls [p]rivate key file, [c]ertificate file: string use authenticated secure TLS connection

+tla --anonymous-tls use secure TLS connection without certificate

private key password (only with --enable-tls):

+ps --std-passwd prompt user to type password on stdin (default)

+pw --use-passwd [p]assword: string use specified password

-pw --null-passwd use empty string as password

key and certificate file format:

-pem --pem-keys read keys and certificates as PEM file (default)

-der --der-keys read keys and certificates as DER file

certification authority: +cf --add-cert-file [c]ertificate filename: string add certificate file to list of certificates

+cd --add-cert-dir [c]ertificate directory: string add certificates in d to list of certificates


+cs --cipher [c]iphersuite name: string add ciphersuite to list of negotiated suites

+dp --dhparam [f]ilename: string read DH parameters for DH/DSS ciphersuites

pseudo random generator:

+rs --seed [f]ilename: string seed random generator with contents of f

+ws --write-seed write back modified seed (only with --seed)

+wf --write-seed-file [f]ilename: string (only with --seed) write modified seed to file f

peer authentication:

-rc --require-peer-cert verify peer certificate, fail if absent (default)

-vc --verify-peer-cert verify peer certificate if present

-ic --ignore-peer-cert don’t verify peer certificate


    DICOM Conformance

The echoscu application supports the following SOP Classes as an SCU:

VerificationSOPClass 1.2.840.10008.1.1

Unless the --propose-ts option is used, the echoscu application will only propose the transfer syntax

LittleEndianImplicitTransferSyntax 1.2.840.10008.1.2


The level of logging output of the various command line tools and underlying libraries can be specified by the user. By default, only errors and warnings are written to the standard error stream. Using option --verbose also informational messages like processing details are reported. Option --debug can be used to get more details on the internal activity, e.g. for debugging purposes. Other logging levels can be selected using option --log-level. In --quiet mode only fatal errors are reported. In such very severe error events, the application will usually terminate. For more details on the different logging levels, see documentation of module ’oflog’.

In case the logging output should be written to file (optionally with logfile rotation), to syslog (Unix) or the event log (Windows) option --log-config can be used. This configuration file also allows for directing only certain messages to a particular output stream and for filtering certain messages based on the module or application where they are generated. An example configuration file is provided in <etcdir>/logger.cfg).


All command line tools use the following notation for parameters: square brackets enclose optional values (0-1), three trailing dots indicate that multiple values are allowed (1-n), a combination of both means 0 to n values.

Command line options are distinguished from parameters by a leading ’+’ or ’-’ sign, respectively. Usually, order and position of command line options are arbitrary (i.e. they can appear anywhere). However, if options are mutually exclusive the rightmost appearance is used. This behaviour conforms to the standard evaluation rules of common Unix shells.

In addition, one or more command files can be specified using an ’@’ sign as a prefix to the filename (e.g. @command.txt). Such a command argument is replaced by the content of the corresponding text file (multiple whitespaces are treated as a single separator unless they appear between two quotation marks) prior to any further evaluation. Please note that a command file cannot contain another command file. This simple but effective approach allows to summarize common combinations of options/parameters and avoids longish and confusing command lines (an example is provided in file <datadir>/dumppat.txt).


The echoscu utility will attempt to load DICOM data dictionaries specified in the DCMDICTPATH environment variable. By default, i.e. if the DCMDICTPATH environment variable is not set, the file <datadir>/dicom.dic will be loaded unless the dictionary is built into the application (default for Windows).

The default behaviour should be preferred and the DCMDICTPATH environment variable only used when alternative data dictionaries are required. The DCMDICTPATH environment variable has the same format as the Unix shell PATH variable in that a colon (’:’) separates entries. On Windows systems, a semicolon (’;’) is used as a separator. The data dictionary code will attempt to load each file specified in the DCMDICTPATH environment variable. It is an error if no data dictionary can be loaded.


Copyright (C) 1994-2010 by OFFIS e.V., Escherweg 2, 26121 Oldenburg, Germany.

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Version 3.6.0 ECHOSCU (1) 6 Jan 2011

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