[asterisk-users] Phones Not Registering

[Brett Crapser]

On Thu, 22 Nov 2007, Edwin Kariuki wrote:
> Hi,
>
> 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.
>
> 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.
>
> What could be the cause of this?

What kind of voip platform?
What SIP server?
Out over the Internet or local lan or a VPN?

Going to need a lot more information...

Brett