[Asterisk-Users] SNOM 220 with >7 "lines"

[Michael Welter]

I have a SNOM 220 with a 20-button sidecar.

The configuration for the five lines (buttons) on the main phone is 
straigth forward: display name, account, password, registrar.

I would like to get each of the sidecar buttons to register with 
Asterisk in "Line" mode so that I can have incoming calls from each DID 
number appear on a separate button.

For the sidecar buttons, however, all I have is a URL.  I've tried 
"sip:421 at domain.net" which won't work because there's no password.  I've 
tried "sip:421:1234 at domain.net", but the ":" is converted into a "%3a" 
and it doesn't register.  "\:" doesn't work either.

Does anyone have any insight?

Thanks,