This file is indexed.

/etc/asterisk/mgcp.conf is in asterisk-config 1:13.18.3~dfsg-1ubuntu4.

This file is owned by root:root, with mode 0o640.

The actual contents of the file can be viewed below.

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;
; MGCP Configuration for Asterisk
;
[general]
;port = 2427
;bindaddr = 0.0.0.0

; See https://wiki.asterisk.org/wiki/display/AST/IP+Quality+of+Service for a description of these parameters.
;tos=cs3		; Sets TOS for signaling packets.
;tos_audio=ef		; Sets TOS for RTP audio packets.
;cos=3			; Sets 802.1p priority for signaling packets.
;cos_audio=5		; Sets 802.1p priority for RTP audio packets.

; --------------------- DIGIT TIMEOUTS ----------------------------
firstdigittimeout = 30000 ; default 16000 = 16s
gendigittimeout = 10000   ; default  8000 = 8s 
matchdigittimeout = 5000  ; defaults 3000 = 3s

; ----------------------------- JITTER BUFFER CONFIGURATION --------------------------
; jbenable = yes              ; Enables the use of a jitterbuffer on the receiving side of a
                              ; MGCP channel. Defaults to "no". An enabled jitterbuffer will
                              ; be used only if the sending side can create and the receiving
                              ; side can not accept jitter. The MGCP channel can accept jitter,
                              ; thus an enabled jitterbuffer on the receive MGCP side will only
                              ; be used if the sending side can create jitter and jbforce is
                              ; also set to yes.

; jbforce = no                ; Forces the use of a jitterbuffer on the receive side of a MGCP
                              ; channel. Defaults to "no".

; jbmaxsize = 200             ; Max length of the jitterbuffer in milliseconds.

; jbresyncthreshold = 1000    ; Jump in the frame timestamps over which the jitterbuffer is
                              ; resynchronized. Useful to improve the quality of the voice, with
                              ; big jumps in/broken timestamps, usually sent from exotic devices
                              ; and programs. Defaults to 1000.

; jbimpl = fixed              ; Jitterbuffer implementation, used on the receiving side of a MGCP
                              ; channel. Two implementations are currently available - "fixed"
                              ; (with size always equals to jbmax-size) and "adaptive" (with
                              ; variable size, actually the new jb of IAX2). Defaults to fixed.

; jbtargetextra = 40          ; This option only affects the jb when 'jbimpl = adaptive' is set.
                              ; The option represents the number of milliseconds by which the new
                              ; jitter buffer will pad its size. the default is 40, so without
                              ; modification, the new jitter buffer will set its size to the jitter
                              ; value plus 40 milliseconds. increasing this value may help if your
                              ; network normally has low jitter, but occasionally has spikes.

; jblog = no                  ; Enables jitterbuffer frame logging. Defaults to "no".
; ----------------------------------------------------------------------------------

;[dlinkgw]
;host = 192.168.0.64
;context = default
;directmedia = no
;line => aaln/2
;line => aaln/1

;; The MGCP channel supports the following service codes:
;; # - Transfer
;; *67 - Calling Number Delivery Blocking 
;; *70 - Cancel Call Waiting 
;; *72 - Call Forwarding Activation 
;; *73 - Call Forwarding Deactivation 
;; *78 - Do Not Disturb Activation 
;; *79 - Do Not Disturb Deactivation 
;; *8 - Call pick-up
;
; known to work with Swissvoice IP10s 
;[192.168.1.20] 
;context=local 
;host=192.168.1.20 
;callerid = "John Doe" <123> 
;callgroup=0      ; in the range from 0 to 63
;pickupgroup=0    ; in the range from 0 to 63
;nat=no 
;threewaycalling=yes 
;transfer=yes     ; transfer requires threewaycalling=yes. Use FLASH to transfer
;callwaiting=yes  ; this might be a cause of trouble for ip10s
;cancallforward=yes 
;line => aaln/1 
;

;[dph100]
;
; Supporting the DPH100M requires defining DLINK_BUGGY_FIRMWARE in
; chan_mgcp.c in addition to enabling the slowsequence mode due to
; bugs in the D-Link firmware
;
;context=local
;host=dynamic
;dtmfmode=none		; DTMF Mode can be 'none', 'rfc2833', or 'inband' or
			; 'hybrid' which starts in none and moves to inband.  Default is none.
;slowsequence=yes	; The DPH100M does not follow MGCP standards for sequencing
;line => aaln/1

; known to work with wave7optics FTTH LMGs
;[192.168.1.20]
;accountcode	= 1000		; record this in cdr as account identification for billing
;amaflags	= billing	; record this in cdr as flagged for 'billing',
				; 'documentation', or 'omit'
;context	= local
;host		= 192.168.1.20
;wcardep	= aaln/*	; enables wildcard endpoint and sets it to 'aaln/*' 
				; another common format is '*'
;callerid 	= "Duane Cox" <123>	; now lets setup line 1 using per endpoint configuration...
;callwaiting	= no
;callreturn	= yes
;cancallforward = yes
;directmedia	= no
;transfer	= no
;dtmfmode	= inband
;setvar=one=1           ; Set channel variables associated with this incoming line
;setvar=two=2
;line => aaln/1			; now lets save this config to line1 aka aaln/1
;clearvars=all          ; Reset list of variables back to none
;callerid 	= "Duane Cox" <456>	; now lets setup line 2
;callwaiting	= no
;callreturn	= yes
;cancallforward = yes
;directmedia	= no
;transfer	= no
;dtmfmode	= inband
;line => aaln/2			; now lets save this config to line2 aka aaln/2

; PacketCable
;[sbv5121e-mta.test.local]
;host        = 10.0.1.3
;callwaiting = 1
;canreinvite = 1
;dtmfmode    = rfc2833
;amaflags    = BILLING
;ncs         = yes ; Use NCS 1.0 signalling
;pktcgatealloc = yes ; Allocate DQOS gate on CMTS
;hangupongateremove = yes ; Hangup the channel if the CMTS close the gate
;callerid    = 3622622225
;accountcode = test-3622622225
;line        = aaln/1
;callerid    = 3622622226
;accountcode = test-3622622226
;line        = aaln/2