Improved attended call transfer and call hold/resume

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

@@ -57,11 +57,15 @@ class Call(val callp: Long, val ua: UserAgent, val peerUri: String, val dir: Str
     }
 
     fun hold(): Boolean {
-        return Api.call_hold(callp, true) == 0
+        if (Api.call_hold(callp, true) == 0)
+            onhold = true
+        return onhold
     }
 
     fun resume(): Boolean {
-        return Api.call_hold(callp, false) == 0
+        if (Api.call_hold(callp, false) == 0)
+            onhold = false
+        return !onhold
     }
 
     fun transfer(uri: String): Boolean {
@@ -146,8 +150,8 @@ class Call(val callp: Long, val ua: UserAgent, val peerUri: String, val dir: Str
         }
 
         fun isAnyCallActive(ctx: Context): Boolean {
-            // Check SIP calls managed by baresip
+            // Check if there exist SIP calls that are not onhold or held
-            if (inCall()) return true
+            if (BaresipService.calls.any { !it.onhold && !it.held }) return true
             // MODE_IN_CALL indicates a PSTN call is active
             val am = ctx.getSystemService(Context.AUDIO_SERVICE) as AudioManager
             return am.mode == AudioManager.MODE_IN_CALL

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

@@ -1531,14 +1531,12 @@ private fun CallRow(
                                 "AoR ${call.ua.account.aor} resuming call ${call.callp} with ${call.callUri.value}"
                             )
                             call.resume()
-                            call.onhold = false
                         } else {
                             Log.d(
                                 TAG,
                                 "AoR ${call.ua.account.aor} holding call ${call.callp} with ${call.callUri.value}"
                             )
                             call.hold()
-                            call.onhold = true
                         }
                     },
                 ) {
@@ -2157,6 +2155,7 @@ private fun transfer(ctx: Context, viewModel: ViewModel, ua: UserAgent, uriText:
                 if (call.hold()) {
                     call.referTo = uri
                     call(ctx, viewModel, ua, uri, false,call)
+                    showCall(ctx, viewModel, ua, call)
                 }
             }
             else {