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The

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supports domain name resolution through external DNS servers. Each IP address context defines one or more DNS server groups. Each DNS server group contains upto eight DNS servers. The zone and/or SIP Trunk Group indicates the DNS Server Group to use for the requests, which require a DNS resolution.

Within a DNS server group, each server has both a priority and a weight. Requests are sent to the server with highest priority (lower value) first. Servers of a lower priority are only used when all servers of a higher priority are marked unavailable based on previous timeouts. If multiple servers of the same priority exist, requests are load-balanced across servers in proportion to their weights.

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