SipAudioCall without registering a local SipProfil

Question

I'm trying to use the native Android SIP stack to make direct SIP calls within a LAN. It appears that within the native stack, you are required to register a local profile in order to make SIP calls.

Here is the code I (try to) use to register a profile. I do not have a SIP server on this network, so I just use localhost for a domain.

    if (mSipManager == null) {
        mSipManager = SipManager.newInstance(mContext);

        try {
            SipProfile.Builder builder = new SipProfile.Builder("foo", "localhost");
            builder.setPassword("bar");

            mSipProfile = builder.build();
            mSipManager.register(mSipProfile, 30000, new SipRegistrationListener() {

                public void onRegistering(String localProfileUri) {
                    Log.v(TAG, "Registering with profile with SIP Server. URI: " + localProfileUri);
                }

                public void onRegistrationDone(String localProfileUri, long expiryTime) {
                    Log.v(TAG, "Registered with profile with SIP Server. URI: " + localProfileUri);
                }

                public void onRegistrationFailed(String localProfileUri, int errorCode,
                                                 String errorMessage) {
                    Log.e(TAG, "Registration failed.  Code: " + Integer.toString(errorCode));
                    Log.e(TAG, errorMessage);
                }
            });
        } catch (ParseException e) {
            Log.e(TAG, "Unable to set up local SipProfile.", e);
        } catch (SipException e) {
            Log.e(TAG, "Unable to open local SipProfile.", e);
        }
    }

Elsewhere, here is my code for making a call:

try {
        Log.v(TAG, "VOIP Supported: " + SipManager.isVoipSupported(mActivity));
        Log.v(TAG, "SIP API Supported: " + SipManager.isApiSupported(mActivity));

        SipProfile.Builder builder = new SipProfile.Builder(mSipUri);
        SipProfile remote = builder.build();

        SipAudioCall.Listener listener = new SipAudioCall.Listener() {
            @Override
            public void onCalling(SipAudioCall call) {
                Log.d(TAG, "SIP Call initiating...");
            }

            @Override
            public void onCallEstablished(SipAudioCall call) {
                Log.d(TAG, "SIP Call established.");

                call.startAudio();
                call.setSpeakerMode(true);
                call.toggleMute();
            }

            @Override
            public void onCallEnded(SipAudioCall call) {
                Log.d(TAG, "SIP Call ended.");
            }

            @Override
            public void onError(SipAudioCall call, int errorCode, String errorMessage) {
                Log.e(TAG, "SIP Call Error. Code: " + Integer.toString(errorCode));
                Log.e(TAG, errorMessage);
            }
        };

        mSipCall = mSipManager.makeAudioCall(mSipProfile, remote, listener, 10);

    } catch (ParseException e) {
        Log.e(TAG, "Unable to set up remote SipProfile.", e);
    } catch (SipException e) {
        Log.e(TAG, "SipAudioCall error.", e);
    }

This all results in the following logcat output:

 11-20 11:46:33.150    1412-1412/package.name E/XmlTest﹕ 1- Unable to open local SipProfile.
         android.net.sip.SipException: SipService.createSession() returns null
         at android.net.sip.SipManager.register(SipManager.java:481)

I'm unable to find further details as to why createSession is returning null; is it because I've not provided a valid server for the profile to register with? If so, is there a way to use the native SIP stack without registering with a server?

Answer 1

It turns out the problem is that Android's SIP stack appears to require the local SIP Profile you provide to the SIPManager (in the first codeblock above, represented by builder and mSipProfile) to have a valid IP address supplied to it.

Where I originally specified "localhost", you must actually provide the IP address of whatever interface you are making the SIP call over; if you are using a VPN, you must provide the IP of the VPN interface.