SPA5xx Configuration

In the Endpoint Configuration Manager Advanced setting global configuration, I have set “Configuration Type” as “Web (HTTP)”.

When configuring SPA504 or SPA525G2, the configuration manager sets the download protocol to TFTP.

After the initial configuration of the phone (manually specifying http://pbx:84/spa$PSN.cfg), the phone configuration changes to the config file specified TFTP - which does not work over the Internet (firewall not allowed).

When looking at the global settings value of an individually configured endpoint, it is specified as TFTP and cannot be changed (greyed out).

How can this value be set correctly so that the SPA5xx will configure via HTTP consistantly?