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APPLIES TO: 
2015 
2019
Subscription Edition
You define the IPv4 or IPv6 addresses for the IP or phone switched telephone network (PSTN) gateway by selecting either Enable IPv4 or Enable IPv6. You can choose either Use all configured IP addresses or Limit service usage to selected IP addresses.
If you select Use all configured IP addresses, all addresses configured on the gateway will be used. Optionally, select Limit service usage to selected IP addresses, which enables the PSTN IP address entry. Enter the IPv4 or IPv6 address that has been assigned for this gateway.