Settings: Forcing NAPTR Lookups
The reg.1.server.1.port, reg.1.server.2.port,
reg.1.server.1.transport, and reg.1.server.2.transport values in
this example are set to null to force NAPTR lookups.
Using Static DNS Cache for Redundancy
Failover redundancy can only be utilized when the configured IP server hostname resolves
(through SRV or A record) to multiple IP addresses. Unfortunately, some customer’s are unable
to configure the DNS to take advantage of failover redundancy.
The solution is to provide the ability to statically configure a set of DNS NAPTR SRV and/or A
records into the handset.
When a handset is configured with a DNS server, it will behave as follows by default:
An initial attempt to resolve a hostname that is within the static DNS cache, for example
to register with its SIP registrar, results in a query to the DNS.
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