Hi,<br><br>I have a voip platform that has a SIP server where about 450 sipura phones & adaptors register. On two occassions some phones (which were previously working) have refused to register with certain IPs but when I change the IP the phones register. The failing IP can the work after two days.<br><br>A trace from the server shows that the phone is sending a registration signal to the server & that the server is also sending back the same but its not getting to the phone.<br><br>What could be the cause of this?<br><br>Thanks,<br><br>Edwin<br><p> 
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