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Cisco 79X1 backup proxy error

I"ve got some phones with SIP firmware 41.8-5 4S.

I've got a backup proxy. If I shut down the main server, it works fine: phone can receive and send calls through the backup proxy.

If I reboot the phone, it tries to connect to the main proxy and fails. (so far, so good).

The big problem is that I can't make calls through the backup proxy : if I dial, nothing happens, and when I receive calls from the backup proxy, my phone continues ringing even if I take my handset offhook.

In conclusion, between two reboots, the phone must have been registering at least one time to the main server to get the calls working with the backup proxy. If not, phone is ununsable.

Is there a way to correct it, or a firmware update?