I did not enable the multiple_registation parameter in sip profile, but I am seeing multiple registrations of the same user in the sip_registration table through odbc. 

Here is how it happened, the client (pjsip) is registering through TCP, without un-registering, the client failed and got restarted again. Hence another registration was fired to the server; however, it did not replace the previous record, but instead created an additional one. 

Now, can someone explain to me how that is possible? How can I make sure the new registration overwrite the previous one. The only thing different is that every time when the client register again, it's using a different TCP port. Can that be the cause of multiple record? If so, what should I do?

Here is an example of the registered record from sip_registration table except the TCP port number is different every time. I have also masked the IP addresses and sip_user

Thanks,

Henry