Unable to resolve hostnames

I’m unable to make outbound calls from certain extensions and I’m seeing this error in my Asterisk log files. It looks like the PBX is unable to lookup the termination SIP URI. What would be causing this? Also, when I go into Asterisk SIP settings and try and detect network settings I get an error that says “unable to resolve host”

[2020-09-01 11:52:18] ERROR[2033] netsock2.c: getaddrinfo("TERMINATION SIP URI", "(null)", ...): Temporary failure in name resolution
[2020-09-01 11:52:18] WARNING[2033] acl.c: Unable to lookup 'TERMINATION SIP URI

TERMINATION SIP URI is the placeholder for my actual termination SIP URI.

Have you set up and checked the DNS resolver on the server?

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