In your PAP2, what settings are you using for the following?
SIP Port:
Proxy:
Outbound Proxy:
Use Outbound Proxy:
Use OB Proxy In Dialog:
"Reg Retry Intvl:' is probably 30, you should change that to 120, or longer, in case of another outage. If your ISP doesn't want people using SIP then you don't want to draw their attention by sending many SIP packets. Your ISP may now be preventing the PAP2 from registering. You could try leaving the PAP2 off for a day then retry.
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