/etc/asterisk/res_stun_monitor.conf is in asterisk-config 1:1.8.10.1~dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o640.
The actual contents of the file can be viewed below.
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; Configuration file for the res_stun_monitor module
;
; The res_stun_monitor module sends STUN requests to a configured STUN server
; periodically. If the monitor detects a change in the external IP address or port
; provided by the STUN server an event is sent out internally within Asterisk
; to alert all listeners to that event of the change.
; The current default listeners for the network change event include chan_sip
; and chan_iax. Both of these channel drivers by default react to this event
; by renewing all outbound registrations. This allows the endpoints Asterisk
; is registering with to become aware of the address change and know the new
; location.
;
[general]
;
; ---- STUN Server configuration ---
; Setting the 'stunaddr' option to a valid address enables the STUN monitor.
;
;stunaddr = mystunserver.com ; Address of the STUN server to query.
; Valid form:
; [(hostname | IP-address) [':' port]]
; The port defaults to the standard STUN port (3478).
; Set to an empty value to disable STUN monitoring.
; Default is disabled.
;stunrefresh = 30 ; Number of seconds between STUN refreshes.
; Default is 30.
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