I got the DVG-1402S up and running with my Uniden cordless phone. It worked fine for a couple of days, then I went to pick up, broken dial tone (which is actually produced by the router) and incoming calls would go straight to voicemail.
Couldn't figure this out but after poking around the config interface there is a section called "Query Registeration State" (sic)
Click the Query button and it says "registration_failed"
Click the Register button and it comes back with a URL:
sip:@203.184.16.2;expires=142
Every time I click query since then it comes back with the same, which keeps resetting itself at zero i.e. it appears to re-register so that the expiry goes back up to the high value. And the phone is working again.
The address 203.184.16.2 looks up to italksrv2.tranzpeer.net
The server that I put into my configuration settings is chc.italk.co.nz which also looks up to 203.184.16.2
So what caused the registration to fail? Did Slingshot change something on their end like the IP address?
Is there something I missed in the configuration settings of the router that it dropped the registration after a certain period?