diff --git a/app/src/main/kotlin/com/tutpro/baresip/Api.kt b/app/src/main/kotlin/com/tutpro/baresip/Api.kt
index 3fbe7c42..f778cab8 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Api.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Api.kt
@@ -20,6 +20,8 @@ object Api {
 
     const val CALL_STATE_EARLY = 4
 
+    const val REPLACES = 1
+
     external fun account_set_display_name(acc: Long, dn: String): Int
     external fun account_display_name(acc: Long): String
     external fun account_aor(acc: Long): String
diff --git a/app/src/main/kotlin/com/tutpro/baresip/Call.kt b/app/src/main/kotlin/com/tutpro/baresip/Call.kt
index 6780541e..3762fb6e 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Call.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Call.kt
@@ -129,8 +129,6 @@ 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
         }
diff --git a/app/src/main/kotlin/com/tutpro/baresip/MainScreen.kt b/app/src/main/kotlin/com/tutpro/baresip/MainScreen.kt
index ceb55ec9..d2f6cc3c 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/MainScreen.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/MainScreen.kt
@@ -1579,7 +1579,7 @@ private fun CallRow(
                         enabled = call.transferButtonEnabled.value,
                         onClick = {
                             if (call.onHoldCall != null) {
-                                if (!Api.call_supported(call.callp, Call.REPLACES)) {
+                                if (!Api.call_supported(call.callp, API.REPLACES)) {
                                    alertTitle.value = ctx.getString(R.string.notice)
                                     alertMessage.value = ctx.getString(R.string.replaces_not_supported)
                                     showAlert.value = true