Exception during DNS lookup: java.lang.NullPointerException

[wangpeng1]

Exception during DNS lookup: java.lang.NullPointerException, Attempt to invoke interface method 'java.util.Iterator java.util.Collection.iterator()' on a null object reference
01-17 15:42:27.624 5751-5751/? E/IntegratedSipProvider: java.lang.Exception: No DNS SRV or A results found for: null
at org.zoolu.sip.provider.SipProvider.sendMessage(SipProvider.java:772)
at org.zoolu.sip.provider.SipProvider.sendMessage(SipProvider.java:974)
at org.zoolu.sip.transaction.TransactionClient.onTimeout(TransactionClient.java:156)
at org.zoolu.tools.Timer.onInnerTimeout(Timer.java:131)
at org.lumicall.android.AndroidTimer.onTimeout(AndroidTimer.java:88)
at org.lumicall.android.AndroidTimer.onReceive(AndroidTimer.java:78)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:3054)
at android.app.ActivityThread.-wrap18(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1570)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6166)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)