Number to dial out of the switch and access the public network or a private network to place an international call.
The international prefix in North America is 011.
An international access code in England: 00.
The format of the full dialing prefix depends on whether you use a private network or a public network to place international calls. The international prefix is combined with either a private network prefix (such as the ESN prefix) or the local prefix to generate the full dialing prefix.