diff --git a/src/preferences.cpp b/src/preferences.cpp
index 86dcea4f6543083fd69ac537a802c7ec0fb2d7a9..649dd612a1d652163cb9e2c0a2c9b3e008af8cb3 100644
--- a/src/preferences.cpp
+++ b/src/preferences.cpp
@@ -96,8 +96,6 @@ constexpr const char* const VoipPreference::CONFIG_LABEL;
 static constexpr const char* PLAY_DTMF_KEY {"playDtmf"};
 static constexpr const char* PLAY_TONES_KEY {"playTones"};
 static constexpr const char* PULSE_LENGTH_KEY {"pulseLength"};
-static constexpr const char* SYMMETRIC_RTP_KEY {"symmetric"};
-static constexpr const char* ZID_FILE_KEY {"zidFile"};
 
 // audio preferences
 constexpr const char* const AudioPreference::CONFIG_LABEL;
@@ -242,7 +240,6 @@ VoipPreference::VoipPreference()
     : playDtmf_(true)
     , playTones_(true)
     , pulseLength_(PULSE_LENGTH_DEFAULT)
-    , symmetricRtp_(true)
 {}
 
 void
@@ -252,8 +249,6 @@ VoipPreference::serialize(YAML::Emitter& out) const
     out << YAML::Key << PLAY_DTMF_KEY << YAML::Value << playDtmf_;
     out << YAML::Key << PLAY_TONES_KEY << YAML::Value << playTones_;
     out << YAML::Key << PULSE_LENGTH_KEY << YAML::Value << pulseLength_;
-    out << YAML::Key << SYMMETRIC_RTP_KEY << YAML::Value << symmetricRtp_;
-    out << YAML::Key << ZID_FILE_KEY << YAML::Value << zidFile_;
     out << YAML::EndMap;
 }
 
@@ -264,8 +259,6 @@ VoipPreference::unserialize(const YAML::Node& in)
     parseValue(node, PLAY_DTMF_KEY, playDtmf_);
     parseValue(node, PLAY_TONES_KEY, playTones_);
     parseValue(node, PULSE_LENGTH_KEY, pulseLength_);
-    parseValue(node, SYMMETRIC_RTP_KEY, symmetricRtp_);
-    parseValue(node, ZID_FILE_KEY, zidFile_);
 }
 
 AudioPreference::AudioPreference()
diff --git a/src/preferences.h b/src/preferences.h
index 2ab1e581bc3a017a83a91389e6d89c6ab2811796..452f4d50664ada5a475bf3561a6bc73c5a52a352 100644
--- a/src/preferences.h
+++ b/src/preferences.h
@@ -123,18 +123,10 @@ public:
 
     void setPulseLength(int length) { pulseLength_ = length; }
 
-    bool getSymmetricRtp() const { return symmetricRtp_; }
-    void setSymmetricRtp(bool sym) { symmetricRtp_ = sym; }
-
-    std::string getZidFile() const { return zidFile_; }
-    void setZidFile(const std::string& file) { zidFile_ = file; }
-
 private:
     bool playDtmf_;
     bool playTones_;
     int pulseLength_;
-    bool symmetricRtp_;
-    std::string zidFile_;
     constexpr static const char* const CONFIG_LABEL = "voipPreferences";
 };