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    <p>SIP is a transaction based protocol, this means, every negotiation process is a transaction (e.g. a basic registration process would imply sending a REISTER request and receive 200 OK response). I posted a small example in <a href="https://stackoverflow.com/a/20443357/1419134">this</a> response.</p> <p>IN_PROGRESS error initially indicates that you tried to start a new transaction, in your scenario you're trying to send a REGISTER request, when client is already in another related one.</p> <p>A quite typical scenario is, in a fast logout/login, trying to register when unregistration process is still running (no 200 OK final response has been received).</p> <p>Main problem regarding Android's SIP implementation and this error code is that it's used when as generic error when processing a SIP request fails so, previous meaning loses its significance. </p> <p>Because of previous problem you would need to check logcat to get more information (you should see something like "~~~~~ SipSessionGroup:: processing ") but, best way to handle this, would be working with different listeners provided by the stack.</p> <p>The stack provides two listeners that can get registration errors: <a href="https://developer.android.com/reference/android/net/sip/SipRegistrationListener.html" rel="nofollow noreferrer">SipRegistrationListener</a> and <a href="https://developer.android.com/reference/android/net/sip/SipSession.Listener.html" rel="nofollow noreferrer">SipSession.Listener</a>. Both provides <a href="https://developer.android.com/reference/android/net/sip/SipRegistrationListener.html#onRegistrationFailed%28java.lang.String,%20int,%20java.lang.String%29" rel="nofollow noreferrer">onRegistrationFailed</a> callback but, later one, also provides <a href="https://developer.android.com/reference/android/net/sip/SipSession.Listener.html#onRegistrationTimeout%28android.net.sip.SipSession%29" rel="nofollow noreferrer">onRegistrationTimeout</a>, that can be quite helpful. Actually, you already used SipRegistrationListener in your code but I don't really get why you say that it should be set after <code>open</code> because <code>open</code> would try to automatically register and, if some error occurs, you won't be notified.</p> <p>On the other hand, main problem with this listeners is that registration can fail because of several reason (you can check a list of different error responses <a href="https://en.wikipedia.org/wiki/SIP_Responses#4xx.E2.80.94Client_Failure_Responses" rel="nofollow noreferrer">here</a>) and current implementation only notifies of error codes >= 500 (those are server and global failures) but not others like quite common 406. This is, in my opinion, an important bug in this stack. </p>
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    1. COThank you so much for answering but can you please explain what should I do now to avoid this
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    2. CO@Bansal_Sneha Please, check latest update.
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    3. COSeriously I appreciate knowledge on this topic but I am using it first time and this is also sample code from sdk .So please can you explain in little bit easily :( also I want to know I can get this error list.It will be helpful to me if you can share that
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