Which authentication protocol does Nokia Series 40 SIP VoIP support?

Nokia Series40 VoIP uses the HTTP Digest Access Authentication protocol defined in RFC 2617 when authenticating to a SIP proxy or registrar server. In the Digest Access Authentication method the passwords are not sent in clear text and it's therefore a more secure authentication method than the Basic Access Authentication method which is the other option described in RFC 2617.


For the SIP authentication to succeed, the correct user name and password must be configured in the VoIP settings.