I would like to set a backup proxy server (SIP) on my SPA508G. I've looked at the documentation, and it does mentions the phone support backup proxy server with the DNS SRV method, but that's not what I want.
In fact, I've not completely understood the behavior of the phone if a backup proxy server is configured and the primary proxy server becomes unavailable. For exemple, if I make a call in this situation, will the phone automatically try to send its SIP INIVITE to the backup proxy server ?
In the Ext1 tab, in the 'Proxy' field, I've tried the value '192.168.1.1:A=192.168.1.2' but it didn't worked (well, the phone didn't tried to fallback on 192.168.1.2 after I've made 192.168.1.1 unreachable).
Any ideas ?