/etc/asterisk/dnsmgr.conf is in asterisk-config 1:11.13.1~dfsg-2+deb8u5.
This file is owned by root:root, with mode 0o640.
The actual contents of the file can be viewed below.
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;enable=yes ; enable creation of managed DNS lookups
; default is 'no'
;refreshinterval=1200 ; refresh managed DNS lookups every <n> seconds
; default is 300 (5 minutes)
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