When I access the SPA509G via web I do not get the option Admin logio / Advance. So it is impossible to enable the expansion module 1 or 2 in this phone model. Can someone tell me how to enable an expansion module SPA500S in a phone SPA509G? I think my problem is more to do with the administration interface of the phone (no Admin login option displayed) than a problem of configuration.
There is no specific list of steps to implement SPA500S on SPA50XG using UC500 as call control.