# HG changeset patch
# User Sebastien Jodogne <s.jodogne@gmail.com>
# Date 1620745051 -7200
# Node ID e932c609c30af1d265d317e40850b5f4c916052b
# Parent  9c23356b94649c5b6cfc0193eecb83d0865c3fd1
note about dns lookup

diff -r 9c23356b9464 -r e932c609c30a Sphinx/source/dicom-guide.rst
--- a/Sphinx/source/dicom-guide.rst	Mon May 10 12:30:57 2021 +0200
+++ b/Sphinx/source/dicom-guide.rst	Tue May 11 16:57:31 2021 +0200
@@ -370,7 +370,7 @@
    displayed by :ref:`Orthanc Explorer <orthanc-explorer>` (possibly
    its AET).
 2. The AET of the remote server.
-3. Its IP address or its hostname.
+3. Its IP address.
 4. Its DICOM port (most probably 104, or 4242 if the remote server is
    another instance of Orthanc).
 
@@ -378,6 +378,14 @@
 software must be restarted to take the new parameters into account.
 
 
+**Remark:** The IP address in the ``DicomModalities`` configuration
+option can possibly be replaced by the hostname of the remote modality
+(obtained by DNS). This will work if Orthanc acts as an SCU to this
+remote modality. However, if the remote modality acts as a SCU that
+can contact Orthanc SCP and if the option ``DicomCheckModalityHost``
+is set to ``true``, you are obliged to use an IP address.
+
+
 .. _dicom-echo:
 
 C-Echo: Testing connectivity