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The

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0series4
supports domain - name resolution via through external DNS servers. Each IP address context defines one or more DNS server groups, each containing up to . Each DNS server group contains upto eight DNS servers. The zone and/or SIP Trunk Group then indicates which the DNS Server Group to use for the requests, which require DNS resolution.

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DNS Cache Management and Override TTL

 The 

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0product
is enhanced in this release to provide the ability to supports the following functionalities:

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  1. To clear a particular record from the cache, request  should request must match DNS group, FQDN, and  the record type.
  2. To clear a domain from the cache,  request should match DNS group name and sub-string from the domain. 

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If an FQDN peer to which the pathCheck profile is attached to is modified with a new FQDN, the pathCheck task clears the associated DNS records for the earlier FQDN and performs a fresh DNS query using the newly updated FQDN.

Extended DNS (eDNS) Support

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0product
prefers DNS over UDP when the UDP payload limit is 512 bytes. The Extended Domain Name System (eDNS) improves the scalability of DNS. With this eDNS support, SBC supports the maximum UDP payload size. This avoids the truncated UDP responses, which in turn try to re-enter over TCP.

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