tracing Outgoing SMS

Question

Dear,

Currently i am using ContentObserver on the Uri

ContentResolver contentResolver = context.getContentResolver();
SMSObserver m_SMSObserver = new SMSObserver(context);
contentResolver.registerContentObserver(Uri.parse("content://sms"), true, m_SMSObserver);

in this manner onChange method call in both the cases i.e incoming and outgoing sms. but i need it only outgoing SMS. and it is noted that

 Uri.parse("content://sms/sent")
 Uri.parse("content://sms/outbox")

not working Kindly help me how i can trace the outgoing message.

thankz.