I have a little problem with my UC540 (last os update ok). When I make an outgoing call, I type the prefix 0 for outgoing and make the others numbers but it take 12 to 15second to execute the call and get the first ring (in my phone outgoing planification all is ok, configured with SIP first) it's a very long delay. I make another test with 9 prefix for analogical outgoing, delay is correct it take 5-6 second to have the first ring. Someone have an idea ? Is there a configuration somewhere to change this delay ?