diff --git a/app/src/main/cpp/baresip.c b/app/src/main/cpp/baresip.c
index 88b763c5..a2304100 100644
--- a/app/src/main/cpp/baresip.c
+++ b/app/src/main/cpp/baresip.c
@@ -948,6 +948,19 @@ Java_com_tutpro_baresip_Api_account_1set_1answermode(JNIEnv *env, jobject thiz,
     return account_set_answermode((struct account *)acc, mode);
 }
 
+JNIEXPORT jboolean JNICALL
+Java_com_tutpro_baresip_Api_account_1rtcp_1mux(JNIEnv *env, jobject thiz, jlong acc)
+{
+    return account_rtcp_mux((struct account *)acc);
+}
+
+JNIEXPORT jint JNICALL
+Java_com_tutpro_baresip_Api_account_1set_1rtcp_1mux(JNIEnv *env, jobject thiz, jlong acc,
+                                                    jboolean value)
+{
+    return account_set_rtcp_mux((struct account *)acc, value);
+}
+
 JNIEXPORT jint JNICALL
 Java_com_tutpro_baresip_Api_account_1dtmfmode(JNIEnv *env, jobject thiz, jlong acc)
 {
diff --git a/app/src/main/kotlin/com/tutpro/baresip/Account.kt b/app/src/main/kotlin/com/tutpro/baresip/Account.kt
index 9b26534e..6034863e 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Account.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Account.kt
@@ -23,6 +23,7 @@ class Account(val accp: Long) {
     var videoCodec = ArrayList<String>()
     var regint = Api.account_regint(accp)
     var mediaEnc = Api.account_mediaenc(accp)
+    var rtcpMux = Api.account_rtcp_mux(accp)
     var dtmfMode = Api.account_dtmfmode(accp)
     var answerMode = Api.account_answermode(accp)
     var vmUri = Api.account_vm_uri(accp)
@@ -117,6 +118,9 @@ class Account(val accp: Long) {
 
         if (mediaEnc != "") res += ";mediaenc=${mediaEnc}"
 
+        if (rtcpMux)
+             res += ";rtcp_mux=yes"
+
         res = if (vmUri == "")
             "$res;mwi=no"
         else
diff --git a/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt
index 0da71749..1af1d076 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt
@@ -43,6 +43,7 @@ class AccountActivity : AppCompatActivity() {
     private lateinit var mediaNatSpinner: Spinner
     private lateinit var mediaEnc: String
     private lateinit var mediaEncSpinner: Spinner
+    private lateinit var rtcpCheck: CheckBox
     private var dtmfMode = Api.DTMFMODE_RTP_EVENT
     private lateinit var dtmfModeSpinner: Spinner
     private var answerMode = Api.ANSWERMODE_MANUAL
@@ -89,6 +90,7 @@ class AccountActivity : AppCompatActivity() {
         stunUser = binding.StunUser
         stunPass = binding.StunPass
         mediaEncSpinner = binding.mediaEncSpinner
+        rtcpCheck = binding.RtcpMux
         dtmfModeSpinner = binding.dtmfModeSpinner
         answerModeSpinner = binding.answerModeSpinner
         vmUri = binding.voicemailUri
@@ -179,6 +181,8 @@ class AccountActivity : AppCompatActivity() {
                                 "stun-turn-server" ->
                                     if (text.isNotEmpty())
                                         acc.stunServer = text
+                                "rtcp-mux" ->
+                                    acc.rtcpMux = text == "yes"
                                 "dtmf-mode" ->
                                     if (text in arrayOf("rtp-event", "sip-info")) {
                                         acc.dtmfMode = if (text == "rtp-event")
@@ -289,6 +293,8 @@ class AccountActivity : AppCompatActivity() {
             }
         }
 
+        rtcpCheck.isChecked = acc.rtcpMux
+
         dtmfMode = acc.dtmfMode
         val dtmfModeKeys = arrayListOf(Api.DTMFMODE_RTP_EVENT, Api.DTMFMODE_SIP_INFO)
         val dtmfModeVals = arrayListOf(getString(R.string.dtmf_inband), getString(R.string.dtmf_info))
@@ -577,6 +583,15 @@ class AccountActivity : AppCompatActivity() {
                     }
                 }
 
+                if (rtcpCheck.isChecked != acc.rtcpMux)
+                    if (Api.account_set_rtcp_mux(acc.accp, rtcpCheck.isChecked) == 0) {
+                        acc.rtcpMux = Api.account_rtcp_mux(acc.accp)
+                        Log.d(TAG, "New rtcpMux is ${acc.rtcpMux}")
+                        save = true
+                    } else {
+                        Log.e(TAG, "Setting of account_rtc_mux failed")
+                    }
+
                 if (dtmfMode != acc.dtmfMode) {
                     if (Api.account_set_dtmfmode(acc.accp, dtmfMode) == 0) {
                         acc.dtmfMode = Api.account_dtmfmode(acc.accp)
@@ -750,6 +765,12 @@ class AccountActivity : AppCompatActivity() {
                 getString(R.string.media_encryption_help)
             )
         }
+        binding.RtcpMuxTitle.setOnClickListener {
+            Utils.alertView(
+                this, getString(R.string.rtcp_mux),
+                getString(R.string.rtcp_mux_help)
+            )
+        }
         binding.DtmfModeTitle.setOnClickListener {
             Utils.alertView(
                 this, getString(R.string.dtmf_mode),
diff --git a/app/src/main/kotlin/com/tutpro/baresip/Api.kt b/app/src/main/kotlin/com/tutpro/baresip/Api.kt
index 678d3afc..312d8f0f 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Api.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Api.kt
@@ -46,6 +46,8 @@ object Api {
     external fun account_vm_uri(acc: Long): String
     external fun account_answermode(acc: Long): Int
     external fun account_set_answermode(acc: Long, mode: Int): Int
+    external fun account_rtcp_mux(acc: Long): Boolean
+    external fun account_set_rtcp_mux(acc: Long, value: Boolean): Int
     external fun account_dtmfmode(acc: Long): Int
     external fun account_set_dtmfmode(acc: Long, mode: Int): Int
     external fun account_extra(acc: Long): String
diff --git a/app/src/main/res/layout/activity_account.xml b/app/src/main/res/layout/activity_account.xml
index e67ed01e..17e21f71 100644
--- a/app/src/main/res/layout/activity_account.xml
+++ b/app/src/main/res/layout/activity_account.xml
@@ -278,6 +278,31 @@
 
         </LinearLayout>
 
+        <RelativeLayout
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal" >
+            <TextView
+                android:id="@+id/RtcpMuxTitle"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_alignParentStart="true"
+                android:layout_centerVertical="true"
+                android:layout_toStartOf="@id/RtcpMux"
+                android:textSize="18sp"
+                android:text="@string/rtcp_mux" >
+            </TextView>
+            <CheckBox
+                android:id="@+id/RtcpMux"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_alignParentEnd="true"
+                android:layout_gravity="end"
+                android:layout_centerVertical="true"
+                android:checked="false" >
+            </CheckBox>
+        </RelativeLayout>
+
         <TextView
             android:id="@+id/DtmfModeTitle"
             android:layout_width="wrap_content"
diff --git a/app/src/main/res/values-fi/strings.xml b/app/src/main/res/values-fi/strings.xml
index 7fb0a7d1..02c6ff41 100644
--- a/app/src/main/res/values-fi/strings.xml
+++ b/app/src/main/res/values-fi/strings.xml
@@ -181,6 +181,10 @@
         se on käytettävissä), jos puhelun molempien osapuolten tukemaa mediaprotokollaa
         ei saada automaattisesti selvitettyä.
     </string>
+    <string name="rtcp_mux">RTCP-multipleksaus</string>
+    <string name="rtcp_mux_help">Jos merkitty, RTP- and RTCP-paketit multipleksataan samaan porttiin
+        (RFC 5761).
+    </string>
     <string name="dtmf_mode">DTMF-moodi</string>
     <string name="dtmf_mode_help">Valitsee tavan, miten DTMF-merkit 0–9, #, * ja A-D lähetetään.</string>
     <string name="dtmf_inband">RTP</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 100fc818..ca2242da 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -177,6 +177,8 @@
     </string>
     <string name="prefer_ipv6_media">Prefer IPv6 Media</string>
     <string name="prefer_ipv6_media_help">If checked, offer to use IPv6 media protocol (if available) when media protocol of peer cannot be automatically determined.</string>
+    <string name="rtcp_mux">RTCP Multiplexing</string>
+    <string name="rtcp_mux_help">If checked, RTP and RTCP packets are multiplexed on a single port (RFC 5761).</string>
     <string name="dtmf_mode">DTMF Mode</string>
     <string name="dtmf_mode_help">Selects how DTMF tones 0–9, #, *, and A-D are sent.</string>
     <string name="dtmf_inband">In-band RTP Events</string>