The phone starts very slowly and waits for a response from SRAPS - Secure Redirection and Provisioning Service. This is the first of a list of services that are prompted for provisioning information when the phone is starting (Provisioning Order).
This issue occurs, when the telephone can resolve the host secure-provisioning.snom.com, but can not reach it, because the firewall drops the packages without replying by ICMP "not reachable".
Such problem does not occurs, if the firewall rejects the packages and sends an answer.
After successful provisioning we advice to change the parameter "provisioning_order" by removing the redirection and to set the parameter setting_server to the appropriate URL.
The defaut is "provisioning_order=redirection:stop pnp:stop dhcp:stop tr69:stop"