In attended call transfer, check if peer supports REPLACES header

app/src/main/cpp/baresip.c

@@ -1414,6 +1414,14 @@ JNIEXPORT jboolean JNICALL Java_com_tutpro_baresip_Api_call_1ismuted(
     return audio_ismuted(call_audio((struct call *)call));
 }
 
+JNIEXPORT jboolean JNICALL Java_com_tutpro_baresip_Api_call_1supported(
+        JNIEnv *env, jobject obj, jlong call, jint tags)
+{
+    (void)env;
+    (void)obj;
+    return call_supported((struct call *)call, tags);
+}
+
 JNIEXPORT jint JNICALL Java_com_tutpro_baresip_Api_call_1transfer(
         JNIEnv *env, jobject obj, jlong call, jstring jPeer)
 {

app/src/main/kotlin/com/tutpro/baresip/Api.kt

@@ -104,6 +104,8 @@ object Api {
     external fun call_replace_transfer(xfer_callp: Long, callp: Long): Boolean
     external fun call_peer_uri(callp: Long): String
     external fun call_diverter_uri(callp: Long): String
+
+    external fun call_supported(callp: Long, header: Int): Boolean
     external fun call_destroy(callp: Long)
 
     external fun calls_mute(mute: Boolean)

app/src/main/kotlin/com/tutpro/baresip/Call.kt

@@ -129,6 +129,8 @@ class Call(val callp: Long, val ua: UserAgent, val peerUri: String, val dir: Str
 
     companion object {
 
+        const val REPLACES = 1
+
         fun calls(): ArrayList<Call> {
             return BaresipService.calls
         }

app/src/main/kotlin/com/tutpro/baresip/MainScreen.kt

@@ -1579,13 +1579,20 @@ private fun CallRow(
                         enabled = call.transferButtonEnabled.value,
                         onClick = {
                             if (call.onHoldCall != null) {
-                                val connection = ConnectionService.connections[call.callp]
+                                if (!Api.call_supported(call.callp, Call.REPLACES)) {
-                                connection?.onHold()
+                                   alertTitle.value = ctx.getString(R.string.notice)
-                                if (!call.executeTransfer()) {
+                                    alertMessage.value = ctx.getString(R.string.replaces_not_supported)
-                                    alertTitle.value = ctx.getString(R.string.notice)
-                                    alertMessage.value = ctx.getString(R.string.transfer_failed)
                                     showAlert.value = true
                                 }
+                                else {
+                                    val connection = ConnectionService.connections[call.callp]
+                                    connection?.onHold()
+                                    if (!call.executeTransfer()) {
+                                        alertTitle.value = ctx.getString(R.string.notice)
+                                        alertMessage.value = ctx.getString(R.string.transfer_failed)
+                                        showAlert.value = true
+                                    }
+                                }
                             }
                             else
                                 showTransferDialog = true

app/src/main/res/values-fi/strings.xml

@@ -521,6 +521,7 @@
     <string name="allow_video_send">Salli video videon lähetys puhelussa \'%1$s\'\?</string>
     <string name="allow_video_recv">Salli video videon vastaanotto puhelussa \'%1$s\'\?</string>
     <string name="call_is_on_hold">Puhelu on pidossa</string>
+    <string name="call_is_connected">Puhelu on yhdistetty</string>
     <string name="rec_in_call">Tallennus voidaan asettaa päälle tai pois vain silloin, kun puhelu
         ei ole yhdistetty</string>
     <string name="call_transfer">Puhelun siirto</string>
@@ -530,6 +531,7 @@
     <string name="choose_destination_uri">Valitse kohteen URI</string>
     <string name="transfer">Siirto</string>
     <string name="transfer_failed">Siirto epäonnistui</string>
+    <string name="replaces_not_supported">Toinen osapuoli ei tue REPLACES ominaisuutta</string>
     <string name="dtmf">DTMF</string>
     <string name="call_info">Puhelutiedot</string>
     <string name="call_info_not_available">Ei saatavilla</string>

app/src/main/res/values/strings.xml

@@ -515,6 +515,7 @@
     <string name="choose_destination_uri">Choose destination URI</string>
     <string name="transfer">Transfer</string>
     <string name="transfer_failed">Transfer failed</string>
+    <string name="replaces_not_supported">Peer does not support REPLACES feature</string>
     <string name="dtmf">DTMF</string>
     <string name="call_info">Call Info</string>
     <string name="call_info_not_available">No info available</string>