/etc/hylafax/config is in hylafax-server 3:6.0.6-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #ContCoverPage: "etc/cover.templ"
#DestControls: "etc/destctrls"
#DialStringRules: "etc/dialrules"
#QualifyCID: "etc/cid"
#QualifyTSI: "etc/tsi"
#ServerTracing: 0x08501
InternationalPrefix: 00
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