This file is indexed.

/etc/asterisk/ccss.conf is in asterisk-config 1:11.7.0~dfsg-1ubuntu1.

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

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
;
; --- Call Completion Supplementary Services ---
;
; For more information about CCSS, see the CCSS user documentation
; https://wiki.asterisk.org/wiki/display/AST/Call+Completion+Supplementary+Services+(CCSS)
;

[general]
; The cc_max_requests option is a global limit on the number of
; CC requests that may be in the Asterisk system at any time.
;
;cc_max_requests = 20
;
; The cc_STATE_devstate variables listed below can be used to change the
; default mapping of the internal state machine tracking the state of
; call completion to an Asterisk Device State value. The acceptable values
; that can be provided are as follows, with a description of what the
; equivalent device BLF that this maps to:
;
;	UNKNOWN      ; Device is valid but channel didn't know state
;	NOT_INUSE    ; Device is not used
;	INUSE        ; Device is in use
;	BUSY         ; Device is busy
;	INVALID      ; Device is invalid
;	UNAVAILABLE  ; Device is unavailable
;	RINGING      ; Device is ringing
;	RINGINUSE    ; Device is ringing *and* in use
;	ONHOLD       ; Device is on hold
;
; These states are used to generate DEVICE_STATE information that can be
; included with Asterisk hints for phones to subscribe to the state information
; or dialplan to check the state using the EXTENSION_STATE() function or
; the DEVICE_STATE() function.
;
; The states are in the format of: "ccss:TECH/ID" so an example of device
; SIP/3000 making a CallCompletionRequest() could be checked  by looking at
; DEVICE_STATE(ccss:SIP/3000) or an Asterisk Hint could be generated such as
;
; [hint-context]
; exten => *843000,hint,ccss:SIP/3000
;
; and then accessed with EXTENSION_STATE(*843000@hint-context)
; or subscribed to with a BLF button on a phone.
;
; The available state mapping and default values are:
;
; cc_available_devstate = NOT_INUSE
; cc_offered_devstate = NOT_INUSE
; cc_caller_requested_devstate = NOT_INUSE
; cc_active_devstate = INUSE
; cc_callee_ready_devstate = INUSE
; cc_caller_busy_devstate = ONHOLD
; cc_recalling_devstate = RINGING
; cc_complete_devstate = NOT_INUSE
; cc_failed_devstate = NOT_INUSE

;
;============================================
;           PLEASE READ THIS!!!
; The options described below should NOT be
; set in this file. Rather, they should be
; set per-device in a channel driver
; configuration file.
;           PLEASE READ THIS!!!
;===========================================
;
;---------------------------------------------------------------------
;                                Timers
;---------------------------------------------------------------------
;There are three configurable timers for all types of CC: the
;cc_offer_timer, the ccbs_available_timer, and the ccnr_available_timer.
;In addition, when using a generic agent, there is a fourth timer,
;the cc_recall_timer. All timers are configured in seconds, and the
;values shown below are the defaults.
;
;When a caller is offered CCBS or CCNR, the cc_offer_timer will
;be started. If the caller does not request CC before the
;cc_offer_timer expires, then the caller will be unable to request
;CC for this call.
;
;cc_offer_timer = 20
;
;Once a caller has requested CC, then either the ccbs_available_timer
;or the ccnr_available_timer will run, depending on the service
;requested. The reason why there are two separate timers for CCBS
;and CCNR is that it is reasonable to want to have a shorter timeout
;configured for CCBS than for CCNR. If the available timer expires
;before the called party becomes available, then the CC attempt
;will have failed and monitoring of the called party will stop.
;
;ccbs_available_timer = 4800
;ccnr_available_timer = 7200
;
; When using a generic agent, the original caller is called back
; when one of the original called parties becomes available. The
; cc_recall_timer tells Asterisk how long it should let the original
; caller's phone ring before giving up. Please note that this parameter
; only affects operation when using a generic agent.
;
;cc_recall_timer = 20
;---------------------------------------------------------------------
;                                Policies
;---------------------------------------------------------------------
; Policy settings tell Asterisk how to behave and what sort of
; resources to allocate in order to facilitate CC. There are two
; settings to control the actions Asterisk will take.
;
; The cc_agent_policy describes the behavior that Asterisk will
; take when communicating with the caller during CC. There are
; three possible options.
;
;never:   Never offer CC to the caller. Setting the cc_agent_policy
;         to this value is the way to disable CC for a call.
;
;generic: A generic CC agent is one which uses no protocol-specific
;         mechanisms to offer CC to the caller. Instead, the caller
;         requests CC using a dialplan function. Due to internal
;         restrictions, you should only use a generic CC agent on
;         phones (i.e. not "trunks"). If you are using phones which
;         do not support a protocol-specific method of using CC, then
;         generic CC agents are what you should use.
;
;native:  A native CC agent is one which uses protocol-specific
;         signaling to offer CC to the caller and accept CC requests
;         from the caller. The supported protocols for native CC
;         agents are SIP, ISDN ETSI PTP, ISDN ETSI PTMP, and Q.SIG
;cc_agent_policy=never
;
; The cc_monitor_policy describes the behavior that Asterisk will
; take when communicating with the called party during CC. There
; are four possible options.
;
;never:   Analogous to the cc_agent_policy setting. We will never
;         attempt to request CC services on this interface.
;
;generic: Analogous to the cc_agent_policy setting. We will monitor
;         the called party's progress using protocol-agnostic
;         capabilities. Like with generic CC agents, generic CC
;         monitors should only be used for phones.
;
;native:  Analogous to the cc_agent_policy setting. We will use
;         protocol-specific methods to request CC from this interface
;         and to monitor the interface for availability.
;
;always:  If an interface is set to "always," then we will accept
;         protocol-specific CC offers from the caller and use
;         a native CC monitor for the remainder of the CC transaction.
;         However, if the interface does not offer protocol-specific
;         CC, then we will fall back to using a generic CC monitor
;         instead. This is a good setting to use for phones for which
;         you do not know if they support protocol-specific CC
;         methodologies.
;cc_monitor_policy=never
;
;
;---------------------------------------------------------------------
;                              Limits
;---------------------------------------------------------------------
;
; The use of CC requires Asterisk to potentially use more memory than
; some administrators would like. As such, it is a good idea to limit
; the number of CC requests that can be in the system at a given time.
; The values shown below are the defaults.
;
; The cc_max_agents setting limits the number of outstanding CC
; requests a caller may have at any given time. Please note that due
; to implementation restrictions, this setting is ignored when using
; generic CC agents. Generic CC agents may only have one outstanding
; CC request.
;
;cc_max_agents = 5
;
; The cc_max_monitors setting limits the number of outstanding CC
; requests can be made to a specific interface at a given time.
;
;cc_max_monitors = 5
;
;---------------------------------------------------------------------
;                            Other
;---------------------------------------------------------------------
;
; When using a generic CC agent, the caller who requested CC will be
; called back when a called party becomes available. When the caller
; answers his phone, the administrator may opt to have a macro run.
; What this macro does is up to the administrator. By default there
; is no callback macro configured.
;
;cc_callback_macro=
;
; Alternatively, the administrator may run a subroutine. By default
; there is no callback subroutine configured.  The subroutine should
; be specified in the format: [[context,]exten,]priority
;
;cc_callback_sub=
;
; When using an ISDN phone and a generic CC agent, Asterisk is unable
; to determine the dialstring that should be used when calling back
; the original caller. Furthermore, if you desire to use any dialstring-
; specific options, such as distinctive ring, you must set this
; configuration option. For non-ISDN phones, it is not necessary to
; set this, since Asterisk can determine the dialstring to use since
; it is identical to the name of the calling device. By default, there
; is no cc_agent_dialstring set.
;
;cc_agent_dialstring=