2 files changed, 31 insertions, 5 deletions
diff --git a/voip/java/android/net/sip/SipAudioCall.java b/voip/java/android/net/sip/SipAudioCall.java
index 286f60b..20ffd1b 100644
--- a/voip/java/android/net/sip/SipAudioCall.java
+++ b/voip/java/android/net/sip/SipAudioCall.java
@@ -519,10 +519,15 @@ public class SipAudioCall {
      * @param session the session that receives the incoming call
      * @param sessionDescription the session description of the incoming call
      * @throws SipException if the SIP service fails to attach this object to
-     *        the session
+     *        the session or VOIP API is not supported by the device
+     * @see SipManager#isVoipSupported
      */
     public void attachCall(SipSession session, String sessionDescription)
             throws SipException {
+        if (!SipManager.isVoipSupported(mContext)) {
+            throw new SipException("VOIP API is not supported");
+        }
+
         synchronized (this) {
             mSipSession = session;
             mPeerSd = sessionDescription;
@@ -548,10 +553,15 @@ public class SipAudioCall {
      *        SIP protocol) is used if {@code timeout} is zero or negative.
      * @see Listener#onError
      * @throws SipException if the SIP service fails to create a session for the
-     *        call
+     *        call or VOIP API is not supported by the device
+     * @see SipManager#isVoipSupported
      */
     public void makeCall(SipProfile peerProfile, SipSession sipSession,
             int timeout) throws SipException {
+        if (!SipManager.isVoipSupported(mContext)) {
+            throw new SipException("VOIP API is not supported");
+        }
+
         synchronized (this) {
             mSipSession = sipSession;
             try {
@@ -595,6 +605,9 @@ public class SipAudioCall {
     public void holdCall(int timeout) throws SipException {
         synchronized (this) {
             if (mHold) return;
+            if (mSipSession == null) {
+                throw new SipException("Not in a call to hold call");
+            }
             mSipSession.changeCall(createHoldOffer().encode(), timeout);
             mHold = true;
             setAudioGroupMode();
@@ -614,6 +627,9 @@ public class SipAudioCall {
      */
     public void answerCall(int timeout) throws SipException {
         synchronized (this) {
+            if (mSipSession == null) {
+                throw new SipException("No call to answer");
+            }
             try {
                 mAudioStream = new AudioStream(InetAddress.getByName(
                         getLocalIp()));
diff --git a/voip/java/android/net/sip/SipManager.java b/voip/java/android/net/sip/SipManager.java
index 2e38662..dce46fe 100644
--- a/voip/java/android/net/sip/SipManager.java
+++ b/voip/java/android/net/sip/SipManager.java
@@ -133,7 +133,7 @@ public class SipManager {
     }
 
     /**
-     * Returns true if the system supports SIP-based VoIP.
+     * Returns true if the system supports SIP-based VOIP API.
      */
     public static boolean isVoipSupported(Context context) {
         return context.getPackageManager().hasSystemFeature(
@@ -305,12 +305,17 @@ public class SipManager {
      * @param timeout the timeout value in seconds. Default value (defined by
      *        SIP protocol) is used if {@code timeout} is zero or negative.
      * @return a {@link SipAudioCall} object
-     * @throws SipException if calling the SIP service results in an error
+     * @throws SipException if calling the SIP service results in an error or
+     *      VOIP API is not supported by the device
      * @see SipAudioCall.Listener#onError
+     * @see #isVoipSupported
      */
     public SipAudioCall makeAudioCall(SipProfile localProfile,
             SipProfile peerProfile, SipAudioCall.Listener listener, int timeout)
             throws SipException {
+        if (!isVoipSupported(mContext)) {
+            throw new SipException("VOIP API is not supported");
+        }
         SipAudioCall call = new SipAudioCall(mContext, localProfile);
         call.setListener(listener);
         SipSession s = createSipSession(localProfile, null);
@@ -332,12 +337,17 @@ public class SipManager {
      * @param timeout the timeout value in seconds. Default value (defined by
      *        SIP protocol) is used if {@code timeout} is zero or negative.
      * @return a {@link SipAudioCall} object
-     * @throws SipException if calling the SIP service results in an error
+     * @throws SipException if calling the SIP service results in an error or
+     *      VOIP API is not supported by the device
      * @see SipAudioCall.Listener#onError
+     * @see #isVoipSupported
      */
     public SipAudioCall makeAudioCall(String localProfileUri,
             String peerProfileUri, SipAudioCall.Listener listener, int timeout)
             throws SipException {
+        if (!isVoipSupported(mContext)) {
+            throw new SipException("VOIP API is not supported");
+        }
         try {
             return makeAudioCall(
                     new SipProfile.Builder(localProfileUri).build(),