diff --git a/app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt b/app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt
index 97472eea..bc49272e 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt
@@ -731,7 +731,7 @@ class BaresipService: Service() {
                         }
                         Log.d(LOG_TAG, "AoR $aor call $callp is closed")
                         stopRinging()
-                        calls.remove(call)
+                        call.remove()
                         if (Call.calls().size == 0) {
                             resetCallVolume()
                             if (am.mode != AudioManager.MODE_NORMAL)
diff --git a/app/src/main/kotlin/com/tutpro/baresip/Call.kt b/app/src/main/kotlin/com/tutpro/baresip/Call.kt
index 80844ce0..8ab069a8 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Call.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Call.kt
@@ -15,6 +15,10 @@ class Call(val callp: String, val ua: UserAgent, val peerURI: String, val dir: S
         BaresipService.calls.add(this)
     }
 
+    fun remove() {
+        BaresipService.calls.remove(this)
+    }
+
     fun connect(uri: String): Int {
         return call_connect(callp, uri)
     }