Handle dialing a SIP call to self.

Reply BUSY HERE response so server may redirect the call to the voice mailbox.

http://b/issue?id=3103072
http://b/issue?id=3109479

Change-Id: I81f5dd59ad87298dd9dda87084538ee460eabba8

voip/java/com/android/server/sip/SipHelper.java

@@ -365,6 +365,10 @@ class SipHelper {
             Response response = mMessageFactory.createResponse(
                     Response.BUSY_HERE, request);
 
+            if (inviteTransaction == null) {
+                inviteTransaction = getServerTransaction(event);
+            }
+
             if (inviteTransaction.getState() != TransactionState.COMPLETED) {
                 if (DEBUG) Log.d(TAG, "send BUSY HERE: " + response);
                 inviteTransaction.sendResponse(response);

voip/java/com/android/server/sip/SipService.java

@@ -430,6 +430,21 @@ public final class SipService extends ISipService.Stub {
         }
     }
 
+    private synchronized boolean callingSelf(SipSessionGroupExt ringingGroup,
+            SipSessionGroup.SipSessionImpl ringingSession) {
+        String callId = ringingSession.getCallId();
+        for (SipSessionGroupExt group : mSipGroups.values()) {
+            if ((group != ringingGroup) && group.containsSession(callId)) {
+                if (DEBUG) Log.d(TAG, "call self: "
+                        + ringingSession.getLocalProfile().getUriString()
+                        + " -> " + group.getLocalProfile().getUriString());
+                return true;
+            }
+        }
+        return false;
+    }
+
+
     private class SipSessionGroupExt extends SipSessionAdapter {
         private SipSessionGroup mSipGroup;
         private PendingIntent mIncomingCallPendingIntent;
@@ -452,6 +467,10 @@ public final class SipService extends ISipService.Stub {
             return mSipGroup.getLocalProfile();
         }
 
+        public boolean containsSession(String callId) {
+            return mSipGroup.containsSession(callId);
+        }
+
         // network connectivity is tricky because network can be disconnected
         // at any instant so need to deal with exceptions carefully even when
         // you think you are connected
@@ -551,7 +570,7 @@ public final class SipService extends ISipService.Stub {
                     (SipSessionGroup.SipSessionImpl) s;
             synchronized (SipService.this) {
                 try {
-                    if (!isRegistered()) {
+                    if (!isRegistered() || callingSelf(this, session)) {
                         session.endCall();
                         return;
                     }

voip/java/com/android/server/sip/SipSessionGroup.java

@@ -231,6 +231,10 @@ class SipSessionGroup implements SipListener {
         }
     }
 
+    synchronized boolean containsSession(String callId) {
+        return mSessionMap.containsKey(callId);
+    }
+
     private synchronized SipSessionImpl getSipSession(EventObject event) {
         String key = SipHelper.getCallId(event);
         SipSessionImpl session = mSessionMap.get(key);
@@ -582,6 +586,7 @@ class SipSessionGroup implements SipListener {
         }
 
         private void processCommand(EventObject command) throws SipException {
+            if (isLoggable(command)) Log.d(TAG, "process cmd: " + command);
             if (!process(command)) {
                 onError(SipErrorCode.IN_PROGRESS,
                         "cannot initiate a new transaction to execute: "
@@ -1050,6 +1055,13 @@ class SipSessionGroup implements SipListener {
                 mSipHelper.sendCancel(mClientTransaction);
                 startSessionTimer(CANCEL_CALL_TIMER);
                 return true;
+            } else if (isRequestEvent(Request.INVITE, evt)) {
+                // Call self? Send BUSY HERE so server may redirect the call to
+                // voice mailbox.
+                RequestEvent event = (RequestEvent) evt;
+                mSipHelper.sendInviteBusyHere(event,
+                        event.getServerTransaction());
+                return true;
             }
             return false;
         }
@@ -1351,6 +1363,10 @@ class SipSessionGroup implements SipListener {
         return DEBUG;
     }
 
+    private static boolean isLoggable(EventObject evt) {
+        return isLoggable(null, evt);
+    }
+
     private static boolean isLoggable(SipSessionImpl s, EventObject evt) {
         if (!isLoggable(s)) return false;
         if (evt == null) return false;