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Im gonna start with the sip registration were gonna walk through this flow again in a common troubleshooting mistake is that folks will overlook where the packet is coming from and - but the way simplest put together you cant reliably look at the SIP headers and determine where the packet was coming from it to the expectation is that you always have access to the IP header so did you all you always for example can see the source IP and the destination IP address when youre trying to troubleshoot so what we show in in for purposes of training is I give a little diagram that shows where the packet is coming from and to that they give you that picture when you look at this in a packet capture type scenario its gonna be different youre gonna look at source and destination IP address and well get a chance to spend a little time together in Wireshark doing just that so lets look at some SIP headers were gonna look at sip registration authentication placing calls negotiating codecs