diff --git a/src/blackmisc/avallclasses.h b/src/blackmisc/avallclasses.h
index 9bb13e0d6..2f6566cdb 100644
--- a/src/blackmisc/avallclasses.h
+++ b/src/blackmisc/avallclasses.h
@@ -20,5 +20,6 @@
 #include "blackmisc/avaircraft.h"
 #include "blackmisc/avaircraftlist.h"
 #include "blackmisc/avinformationmessage.h"
+#include "blackmisc/avselcal.h"
 
 #endif // guard
diff --git a/src/blackmisc/avselcal.cpp b/src/blackmisc/avselcal.cpp
new file mode 100644
index 000000000..b01fe4998
--- /dev/null
+++ b/src/blackmisc/avselcal.cpp
@@ -0,0 +1,209 @@
+#include "avselcal.h"
+
+using namespace BlackMisc::PhysicalQuantities;
+
+namespace BlackMisc
+{
+    namespace Aviation
+    {
+
+        QList<CFrequency> CSelcal::frequencyEquivalents = QList<CFrequency>();
+        QStringList CSelcal::allCodePairs = QStringList();
+
+        /*
+         * Convert to string
+         */
+        QString CSelcal::convertToQString(bool /** i18n **/) const
+        {
+            return this->m_code;
+        }
+
+        /*
+         * Marshall to DBus
+         */
+        void CSelcal::marshallToDbus(QDBusArgument &argument) const
+        {
+            argument << this->m_code;
+        }
+
+        /*
+         * Unmarshall from DBus
+         */
+        void CSelcal::unmarshallFromDbus(const QDBusArgument &argument)
+        {
+            argument >> this->m_code;
+        }
+
+        /*
+         * Equals code?
+         */
+        bool CSelcal::equalsString(const QString &code) const
+        {
+            if (code.isEmpty()) return false;
+            return (this->m_code.compare(code, Qt::CaseInsensitive) == 0);
+        }
+
+        /*
+         * SELCAL code frequencies
+         */
+        QList<CFrequency> CSelcal::getFrequencies() const
+        {
+            QList<CFrequency> f;
+            if (!CSelcal::isValidCode(this->m_code)) return f;
+            for (int pos = 0; pos < this->m_code.length(); pos++)
+            {
+                f.append(CSelcal::audioFrequencyEquivalent(this->m_code.at(pos)));
+            }
+            return f;
+        }
+
+        /*
+         * Valid characters
+         */
+        const QString &CSelcal::validCharacters()
+        {
+            static const QString valid = "ABCDEFGHJKLMPQQRS";
+            return valid;
+        }
+
+        /*
+         * Valid character?
+         */
+        bool CSelcal::isValidCharacter(QChar c)
+        {
+            return CSelcal::validCharacters().contains(c);
+        }
+
+        /*
+         * Valid code
+         */
+        bool CSelcal::isValidCode(const QString &code)
+        {
+            if (code.length() != 4) return true;
+            int p1, p2, p3, p4;
+            if ((p1 = CSelcal::validCharacters().indexOf(code.at(0))) < 0) return false;
+            if ((p2 = CSelcal::validCharacters().indexOf(code.at(1))) < 0) return false;
+            if ((p3 = CSelcal::validCharacters().indexOf(code.at(2))) < 0) return false;
+            if ((p4 = CSelcal::validCharacters().indexOf(code.at(3))) < 0) return false;
+            if (p1 >= p2 || p3 >= p4) return false; // pair in alphabetical order
+            if (p1 == p3 || p2 == p3 || p2 == p4 || p3 == p4) return false; // given letter can be used only once in a SELCAL code
+            return true;
+        }
+
+        /*
+         * Character to frequency equivalent
+         */
+        const PhysicalQuantities::CFrequency &CSelcal::audioFrequencyEquivalent(QChar c)
+        {
+            if (CSelcal::frequencyEquivalents.isEmpty())
+            {
+                QList<CFrequency> frequencies;
+                frequencies
+                        << CFrequency(312.7, CFrequencyUnit::Hz())
+                        << CFrequency(346.7, CFrequencyUnit::Hz())
+                        << CFrequency(384.6, CFrequencyUnit::Hz())
+                        << CFrequency(426.6, CFrequencyUnit::Hz())
+                        << CFrequency(473.2, CFrequencyUnit::Hz())
+                        << CFrequency(524.8, CFrequencyUnit::Hz())
+                        << CFrequency(582.1, CFrequencyUnit::Hz())
+                        << CFrequency(645.7, CFrequencyUnit::Hz())
+                        << CFrequency(716.1, CFrequencyUnit::Hz())
+                        << CFrequency(794.3, CFrequencyUnit::Hz())
+                        << CFrequency(881.0, CFrequencyUnit::Hz())
+                        << CFrequency(977.2, CFrequencyUnit::Hz())
+                        << CFrequency(1083.9, CFrequencyUnit::Hz())
+                        << CFrequency(1202.3, CFrequencyUnit::Hz())
+                        << CFrequency(1333.5, CFrequencyUnit::Hz())
+                        << CFrequency(1479.1, CFrequencyUnit::Hz());
+                CSelcal::frequencyEquivalents = frequencies;
+            }
+            int pos = CSelcal::validCharacters().indexOf(c);
+            Q_ASSERT(pos >= 0);
+            Q_ASSERT(CSelcal::frequencyEquivalents.size() > pos);
+            return CSelcal::frequencyEquivalents.at(pos);
+        }
+
+        /*
+         * Code pairs
+         */
+        const QStringList &CSelcal::codePairs()
+        {
+            if (CSelcal::allCodePairs.isEmpty())
+            {
+                QStringList pairs;
+                for (int p1 = 0; p1 < (CSelcal::validCharacters().length() - 1); p1++)
+                {
+                    for (int p2 = p1 + 1; p2 < CSelcal::validCharacters().length(); p2++)
+                    {
+                        QString pair;
+                        pair.append(CSelcal::validCharacters().at(p1)).append(CSelcal::validCharacters().at(p2));
+                        pairs.append(pair);
+                    }
+                }
+                CSelcal::allCodePairs = pairs;
+            }
+            return CSelcal::allCodePairs;
+        }
+
+        /*
+         * Equal?
+         */
+        bool CSelcal::operator ==(const CSelcal &other) const
+        {
+            if (this == &other) return true;
+            return (this->m_code.compare(other.m_code, Qt::CaseInsensitive) == 0);
+        }
+
+        /*
+         * Unequal?
+         */
+        bool CSelcal::operator !=(const CSelcal &other) const
+        {
+            return !((*this) == other);
+        }
+
+        /*
+         * Hash
+         */
+        uint CSelcal::getValueHash() const
+        {
+            return qHash(this->m_code);
+        }
+
+        /*
+         * metaTypeId
+         */
+        int CSelcal::getMetaTypeId() const
+        {
+            return qMetaTypeId<CSelcal>();
+        }
+
+        /*
+         * is a
+         */
+        bool CSelcal::isA(int metaTypeId) const
+        {
+            if (metaTypeId == qMetaTypeId<CSelcal>()) { return true; }
+            return this->CValueObject::isA(metaTypeId);
+        }
+
+        /*
+         * Compare
+         */
+        int CSelcal::compareImpl(const CValueObject &otherBase) const
+        {
+            const auto &other = static_cast<const CSelcal &>(otherBase);
+            return this->m_code.compare(other.getCode(), Qt::CaseInsensitive);
+        }
+
+        /*
+         * Register metadata
+         */
+        void CSelcal::registerMetadata()
+        {
+            qRegisterMetaType<CSelcal>();
+            qDBusRegisterMetaType<CSelcal>();
+        }
+
+    } // namespace
+} // namespace
diff --git a/src/blackmisc/avselcal.h b/src/blackmisc/avselcal.h
new file mode 100644
index 000000000..78b5a5934
--- /dev/null
+++ b/src/blackmisc/avselcal.h
@@ -0,0 +1,160 @@
+/* Copyright (C) 2013 VATSIM Community / authors
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*!
+    \file
+*/
+
+#ifndef BLACKMISC_SELCAL_H
+#define BLACKMISC_SELCAL_H
+#include "blackmisc/pqfrequency.h"
+#include "valueobject.h"
+
+namespace BlackMisc
+{
+    namespace Aviation
+    {
+        /*!
+         * Value object for SELCAL.
+         * \see http://en.wikipedia.org/wiki/SELCAL
+         * \see http://www.asri.aero/our-services/selcal/ User Guide
+         */
+        class CSelcal : public BlackMisc::CValueObject
+        {
+
+        public:
+            /*!
+             * Default constructor.
+             */
+            CSelcal() {}
+
+            /*!
+             * Constructor.
+             */
+            CSelcal(const QString &code) : m_code(code.trimmed()) {}
+
+            /*!
+             * Constructor.
+             * Needed to disambiguate implicit conversion from string literal.
+             */
+            CSelcal(const char *code) : m_code(code) {}
+
+            /*!
+             * \copydoc CValueObject::toQVariant
+             */
+            virtual QVariant toQVariant() const
+            {
+                return QVariant::fromValue(*this);
+            }
+
+            /*!
+             * \brief Is valid?
+             * \return
+             */
+            bool isValid() const { return CSelcal::isValidCode(this->m_code); }
+
+            /*!
+             * Get SELCAL code
+             */
+            const QString &getCode() const { return this->m_code; }
+
+            /*!
+             * \brief List of 4 frequencies, if list is empty SELCAL code is not valid
+             * \return  either 4 frequencies, or empty list
+             */
+            QList<BlackMisc::PhysicalQuantities::CFrequency> getFrequencies() const;
+
+            /*!
+             * \brief Equal operator ==
+             */
+            bool operator ==(const CSelcal &other) const;
+
+            /*!
+             * \brief Unequal operator !=
+             */
+            bool operator !=(const CSelcal &other) const;
+
+            /*!
+             * \copydoc CValueObject::getValueHash
+             */
+            virtual uint getValueHash() const;
+
+            /*!
+             * \brief Register metadata
+             */
+            static void registerMetadata();
+
+            /*!
+             * \brief Equals given string
+             */
+            bool equalsString(const QString &code) const;
+
+            /*!
+             * \brief Valid SELCAL characters
+             */
+            static const QString &validCharacters();
+
+            /*!
+             * \brief Is given character a valid SELCAL characer?
+             */
+            static bool isValidCharacter(QChar c);
+
+            /*!
+             * Valid SELCAL code?
+             */
+            static bool isValidCode(const QString &code);
+
+            /*!
+             * \brief Audio frequency for character
+             */
+            static const BlackMisc::PhysicalQuantities::CFrequency &audioFrequencyEquivalent(QChar c);
+
+            /*!
+             * \brief All valid code pairs: AB, AC, AD ...
+             */
+            static const QStringList &codePairs();
+
+        protected:
+            /*!
+             * \copydoc CValueObject::convertToQString
+             */
+            virtual QString convertToQString(bool i18n = false) const;
+
+            /*!
+             * \copydoc CValueObject::getMetaTypeId
+             */
+            virtual int getMetaTypeId() const;
+
+            /*!
+             * \copydoc CValueObject::isA
+             */
+            virtual bool isA(int metaTypeId) const;
+
+            /*!
+             * \copydoc CValueObject::compareImpl
+             */
+            virtual int compareImpl(const CValueObject &other) const;
+
+            /*!
+             * \copydoc CValueObject::marshallToDbus
+             */
+            virtual void marshallToDbus(QDBusArgument &argument) const;
+
+            /*!
+             * \copydoc CValueObject::unmarshallFromDbus
+             */
+            virtual void unmarshallFromDbus(const QDBusArgument &argument);
+
+        private:
+            QString m_code;
+            static QList<BlackMisc::PhysicalQuantities::CFrequency> frequencyEquivalents;
+            static QStringList allCodePairs;
+        };
+    } // namespace
+} // namespace
+
+Q_DECLARE_METATYPE(BlackMisc::Aviation::CSelcal)
+
+#endif // guard
diff --git a/src/blackmisc/blackmiscfreefunctions.cpp b/src/blackmisc/blackmiscfreefunctions.cpp
index 514e13882..0e01e9475 100644
--- a/src/blackmisc/blackmiscfreefunctions.cpp
+++ b/src/blackmisc/blackmiscfreefunctions.cpp
@@ -52,6 +52,7 @@ void BlackMisc::Aviation::registerMetadata()
     CAircraftList::registerMetadata();
     CAircraftSituation::registerMetadata();
     CAircraftIcao::registerMetadata();
+    CSelcal::registerMetadata();
 }
 
 /*
diff --git a/src/blacksound/soundgenerator.h b/src/blacksound/soundgenerator.h
index 04e123524..6f281598e 100644
--- a/src/blacksound/soundgenerator.h
+++ b/src/blacksound/soundgenerator.h
@@ -6,6 +6,7 @@
 #ifndef BLACKSOUND_SOUNDGENERATOR_H
 #define BLACKSOUND_SOUNDGENERATOR_H
 
+#include "blackmisc/avselcal.h"
 #include <QIODevice>
 #include <QAudioFormat>
 #include <QAudioDeviceInfo>
@@ -118,6 +119,15 @@ namespace BlackSound
          */
         static void playSignal(qint32 volume, const QList<Tone> &tones, QAudioDeviceInfo device = QAudioDeviceInfo::defaultOutputDevice());
 
+        /*!
+         * \brief Play SELCAL tone
+         * \param volume    0-100
+         * \param selcal
+         * \param device    device to be used
+         * \see BlackMisc::Aviation::CSelcal
+         */
+        static void playSelcal(qint32 volume, const BlackMisc::Aviation::CSelcal &selcal, QAudioDeviceInfo device = QAudioDeviceInfo::defaultOutputDevice());
+
     signals:
         /*!
          * \brief Device was closed