1. <include>
2.   <!-- Preprocessor Variables
3.        These are introduced when configuration strings must be consistent across modules.
4.        NOTICE: YOU CAN NOT COMMENT OUT AN X-PRE-PROCESS line, Remove the line instead.
5.  
6.        YOU SHOULD CHANGE THIS default_password value if you don't want to be subject to any
7.        toll fraud in the future.  It's your responsibility to secure your own system.
8.  
9.        This default config is used to demonstrate the feature set of FreeSWITCH.
10.  
11.   -->
12.   <X-PRE-PROCESS cmd="set" data="default_password=S9Qf4YgJw"/>
13.   <!--
14.       The following variables are set dynamically - calculated if possible by freeswitch - and
15.       are available to the config as $${variable}.  You can see their calculated value via fs_cli
16.       by entering eval $${variable}
17.  
18.       hostname
19.       local_ip_v4
20.       local_mask_v4
21.       local_ip_v6
22.       switch_serial
23.       base_dir
24.       recordings_dir
25.       sound_prefix
26.       sounds_dir
27.       conf_dir
28.       log_dir
29.       run_dir
30.       db_dir
31.       mod_dir
32.       htdocs_dir
33.       script_dir
34.       temp_dir
35.       grammar_dir
36.       certs_dir
37.       storage_dir
38.       cache_dir
39.       core_uuid
40.       zrtp_enabled
41.       nat_public_addr
42.       nat_private_addr
43.       nat_type
44.  
45.   -->
46.  
47.  
48.   <X-PRE-PROCESS cmd="set" data="sound_prefix=$${sounds_dir}/en/us/callie"/>
49.  
50.   <!--
51.       This setting is what sets the default domain FreeSWITCH will use if all else fails.
52.  
53.       FreeSWICH will default to $${local_ip_v4} unless changed.  Changing this setting does
54.       affect the sip authentication.  Please review conf/directory/default.xml for more
55.       information on this topic.
56.   -->
57.   <X-PRE-PROCESS cmd="set" data="domain=cloud-fs.guardhat.net"/>
58.   <!-- <X-PRE-PROCESS cmd="set" data="domain=$${local_ip_v4}"/> -->
59.   <X-PRE-PROCESS cmd="set" data="domain_name=$${domain}"/>
60.   <X-PRE-PROCESS cmd="set" data="hold_music=local_stream://moh"/>
61.   <X-PRE-PROCESS cmd="set" data="use_profile=internal"/>
62.   <X-PRE-PROCESS cmd="set" data="rtp_sdes_suites=AEAD_AES_256_GCM_8|AEAD_AES_128_GCM_8|AES_CM_256_HMAC_SHA1_80|AES_CM_192_HMAC_SHA1_80|AES_CM_128_HMAC_SHA1_80|AES_CM_256_HMAC_SHA1_32|AES_CM_192_HMAC_SHA1_32|AES_CM_128_HMAC_SHA1_32|AES_CM_128_NULL_AUTH"/>
63.   <!--
64.       Enable ZRTP globally you can override this on a per channel basis
65.  
66.       http://wiki.freeswitch.org/wiki/ZRTP (on how to enable zrtp)
67.   -->
68.   <X-PRE-PROCESS cmd="set" data="zrtp_secure_media=true"/>
69.   <!--
70.       NOTICE: When using SRTP it's critical that you do not offer or accept
71.       variable bit rate codecs, doing so would leak information and possibly
72.       compromise your SRTP stream. (FS-6404)
73.  
74.       Supported SRTP Crypto Suites:
75.  
76.       AEAD_AES_256_GCM_8
77.       ____________________________________________________________________________
78.       This algorithm is identical to AEAD_AES_256_GCM (see Section 5.2 of
79.       [RFC5116]), except that the tag length, t, is 8, and an
80.       authentication tag with a length of 8 octets (64 bits) is used.
81.       An AEAD_AES_256_GCM_8 ciphertext is exactly 8 octets longer than its
82.       corresponding plaintext.
83.  
84.  
85.       AEAD_AES_128_GCM_8
86.       ____________________________________________________________________________
87.       This algorithm is identical to AEAD_AES_128_GCM (see Section 5.1 of
88.       [RFC5116]), except that the tag length, t, is 8, and an
89.       authentication tag with a length of 8 octets (64 bits) is used.
90.       An AEAD_AES_128_GCM_8 ciphertext is exactly 8 octets longer than its
91.       corresponding plaintext.
92.  
93.  
94.       AES_CM_256_HMAC_SHA1_80 | AES_CM_192_HMAC_SHA1_80 | AES_CM_128_HMAC_SHA1_80
95.       ____________________________________________________________________________
96.       AES_CM_128_HMAC_SHA1_80 is the SRTP default AES Counter Mode cipher
97.       and HMAC-SHA1 message authentication with an 80-bit authentication
98.       tag. The master-key length is 128 bits and has a default lifetime of
99.       a maximum of 2^48 SRTP packets or 2^31 SRTCP packets, whichever comes
100.       first.
101.  
102.  
103.       AES_CM_256_HMAC_SHA1_32 | AES_CM_192_HMAC_SHA1_32 | AES_CM_128_HMAC_SHA1_32
104.       ____________________________________________________________________________
105.       This crypto-suite is identical to AES_CM_128_HMAC_SHA1_80 except that
106.       the authentication tag is 32 bits. The length of the base64-decoded key and
107.       salt value for this crypto-suite MUST be 30 octets i.e., 240 bits; otherwise,
108.       the crypto attribute is considered invalid.
109.  
110.  
111.       AES_CM_128_NULL_AUTH
112.       ____________________________________________________________________________
113.       The SRTP default cipher (AES-128 Counter Mode), but to use no authentication
114.       method.  This policy is NOT RECOMMENDED unless it is unavoidable; see
115.       Section 7.5 of [RFC3711].
116.  
117.  
118.       SRTP variables that modify behaviors based on direction/leg:
119.  
120.       rtp_secure_media
121.       ____________________________________________________________________________
122.       possible values:
123.           mandatory - Accept/Offer SAVP negotiation ONLY
124.           optional  - Accept/Offer SAVP/AVP with SAVP preferred
125.           forbidden - More useful for inbound to deny SAVP negotiation
126.           false     - implies forbidden
127.           true      - implies mandatory
128.  
129.       default if not set is accept SAVP inbound if offered.
130.  
131.  
132.       rtp_secure_media_inbound | rtp_secure_media_outbound
133.       ____________________________________________________________________________
134.       This is the same as rtp_secure_media, but would apply to either inbound
135.       or outbound offers specifically.
136.  
137.  
138.       How to specify crypto suites:
139.       ____________________________________________________________________________
140.       By default without specifying any crypto suites FreeSWITCH will offer
141.       crypto suites from strongest to weakest accepting the strongest each
142.       endpoint has in common.  If you wish to force specific crypto suites you
143.       can do so by appending the suites in a comma separated list in the order
144.       that you wish to offer them in.
145.  
146.       Examples:
147.  
148.           rtp_secure_media=mandatory:AES_CM_256_HMAC_SHA1_80,AES_CM_256_HMAC_SHA1_32
149.           rtp_secure_media=true:AES_CM_256_HMAC_SHA1_80,AES_CM_256_HMAC_SHA1_32
150.           rtp_secure_media=optional:AES_CM_256_HMAC_SHA1_80
151.           rtp_secure_media=true:AES_CM_256_HMAC_SHA1_80
152.  
153.       Additionally you can narrow this down on either inbound or outbound by
154.       specifying as so:
155.  
156.           rtp_secure_media_inbound=true:AEAD_AES_256_GCM_8
157.           rtp_secure_media_inbound=mandatory:AEAD_AES_256_GCM_8
158.           rtp_secure_media_outbound=true:AEAD_AES_128_GCM_8
159.           rtp_secure_media_outbound=optional:AEAD_AES_128_GCM_8
160.  
161.  
162.       rtp_secure_media_suites
163.       ____________________________________________________________________________
164.       Optionaly you can use rtp_secure_media_suites to dictate the suite list
165.       and only use rtp_secure_media=[optional|mandatory|false|true] without having
166.       to dictate the suite list with the rtp_secure_media* variables.
167.   -->
168.   <!--
169.        Examples of codec options: (module must be compiled and loaded)
170.  
171.        codecname[@8000h|16000h|32000h[@XXi]]
172.  
173.        XX is the frame size must be multples allowed for the codec
174.        FreeSWITCH can support 10-120ms on some codecs.
175.        We do not support exceeding the MTU of the RTP packet.
176.  
177.  
178.        iLBC@30i         - iLBC using mode=30 which will win in all cases.
179.        DVI4@8000h@20i   - IMA ADPCM 8kHz using 20ms ptime. (multiples of 10)
180.        DVI4@16000h@40i  - IMA ADPCM 16kHz using 40ms ptime. (multiples of 10)
181.        speex@8000h@20i  - Speex 8kHz using 20ms ptime.
182.        speex@16000h@20i - Speex 16kHz using 20ms ptime.
183.        speex@32000h@20i - Speex 32kHz using 20ms ptime.
184.        BV16             - BroadVoice 16kb/s narrowband, 8kHz
185.        BV32             - BroadVoice 32kb/s wideband, 16kHz
186.        G7221@16000h     - G722.1 16kHz (aka Siren 7)
187.        G7221@32000h     - G722.1C 32kHz (aka Siren 14)
188.        CELT@32000h      - CELT 32kHz, only 10ms supported
189.        CELT@48000h      - CELT 48kHz, only 10ms supported
190.        GSM@40i          - GSM 8kHz using 40ms ptime. (GSM is done in multiples of 20, Default is 20ms)
191.        G722             - G722 16kHz using default 20ms ptime. (multiples of 10)
192.        PCMU             - G711 8kHz ulaw using default 20ms ptime. (multiples of 10)
193.        PCMA             - G711 8kHz alaw using default 20ms ptime. (multiples of 10)
194.        G726-16          - G726 16kbit adpcm using default 20ms ptime. (multiples of 10)
195.        G726-24          - G726 24kbit adpcm using default 20ms ptime. (multiples of 10)
196.        G726-32          - G726 32kbit adpcm using default 20ms ptime. (multiples of 10)
197.        G726-40          - G726 40kbit adpcm using default 20ms ptime. (multiples of 10)
198.        AAL2-G726-16     - Same as G726-16 but using AAL2 packing. (multiples of 10)
199.        AAL2-G726-24     - Same as G726-24 but using AAL2 packing. (multiples of 10)
200.        AAL2-G726-32     - Same as G726-32 but using AAL2 packing. (multiples of 10)
201.        AAL2-G726-40     - Same as G726-40 but using AAL2 packing. (multiples of 10)
202.        LPC              - LPC10 using 90ms ptime (only supports 90ms at this time in FreeSWITCH)
203.        L16              - L16 isn't recommended for VoIP but you can do it. L16 can exceed the MTU rather quickly.
204.  
205.        These are the passthru audio codecs:
206.  
207.        G729             - G729 in passthru mode. (mod_g729)
208.        G723             - G723.1 in passthru mode. (mod_g723_1)
209.        AMR              - AMR in passthru mode. (mod_amr)
210.  
211.        These are the passthru video codecs: (mod_h26x)
212.  
213.        H261             - H.261 Video
214.        H263             - H.263 Video
215.        H263-1998        - H.263-1998 Video
216.        H263-2000        - H.263-2000 Video
217.        H264             - H.264 Video
218.  
219.        RTP Dynamic Payload Numbers currently used in FreeSWITCH and what for.
220.  
221.        96  - AMR
222.        97  - iLBC (30)
223.        98  - iLBC (20)
224.        99  - Speex 8kHz, 16kHz, 32kHz
225.        100 -
226.        101 - telephone-event
227.        102 -
228.        103 -
229.        104 -
230.        105 -
231.        106 - BV16
232.        107 - G722.1 (16kHz)
233.        108 -
234.        109 -
235.        110 -
236.        111 -
237.        112 -
238.        113 -
239.        114 - CELT 32kHz, 48kHz
240.        115 - G722.1C (32kHz)
241.        116 -
242.        117 - SILK 8kHz
243.        118 - SILK 12kHz
244.        119 - SILK 16kHz
245.        120 - SILK 24kHz
246.        121 - AAL2-G726-40 && G726-40
247.        122 - AAL2-G726-32 && G726-32
248.        123 - AAL2-G726-24 && G726-24
249.        124 - AAL2-G726-16 && G726-16
250.        125 -
251.        126 -
252.        127 - BV32
253.  
254.   -->
255.   <X-PRE-PROCESS cmd="set" data="global_codec_prefs=OPUS,G722,PCMU,PCMA,VP8,H264"/>
256.   <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=OPUS,G722,PCMU,PCMA,VP8,H264"/>
257.   <X-PRE-PROCESS cmd="set" data="media_mix_inbound_outbound_codecs=true"/>
258.   <!--
259.       xmpp_client_profile and xmpp_server_profile
260.       xmpp_client_profile can be any string.
261.       xmpp_server_profile is appended to "dingaling_" to form the database name
262.       containing the "subscriptions" table.
263.       used by: dingaling.conf.xml enum.conf.xml
264.   -->
265.  
266.   <X-PRE-PROCESS cmd="set" data="xmpp_client_profile=xmppc"/>
267.   <X-PRE-PROCESS cmd="set" data="xmpp_server_profile=xmpps"/>
268.   <!--
269.        THIS IS ONLY USED FOR DINGALING
270.  
271.        bind_server_ip
272.  
273.        Can be an ip address, a dns name, or "auto".
274.        This determines an ip address available on this host to bind.
275.        If you are separating RTP and SIP traffic, you will want to have
276.        use different addresses where this variable appears.
277.        Used by: dingaling.conf.xml
278.   -->
279.   <!--<X-PRE-PROCESS cmd="set" data="bind_server_ip=auto"/>-->
280.   <X-PRE-PROCESS cmd="set" data="bind_server_ip=13.58.84.42"/>
281.  
282.   <!-- NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE
283.  
284.        If you're going to load test FreeSWITCH please input real IP addresses
285.        for external_rtp_ip and external_sip_ip
286.   -->
287.  
288.   <!-- external_rtp_ip
289.        Can be an one of:
290.            ip address: "12.34.56.78"
291.            a stun server lookup: "stun:stun.server.com"
292.            a DNS name: "host:host.server.com"
293.        where fs.mydomain.com is a DNS A record-useful when fs is on
294.        a dynamic IP address, and uses a dynamic DNS updater.
295.        If unspecified, the bind_server_ip value is used.
296.        Used by: sofia.conf.xml dingaling.conf.xml
297.   -->
298.   <!--<X-PRE-PROCESS cmd="set" data="external_rtp_ip=stun:stun.freeswitch.org"/>-->
299.   <!--<X-PRE-PROCESS cmd="set" data="external_rtp_ip=13.58.84.42"/>-->
300.   <X-PRE-PROCESS cmd="set" data="external_rtp_ip=stun.services.mozilla.com"/>
301.  
302.   <!-- external_sip_ip
303.       Used as the public IP address for SDP.
304.        Can be an one of:
305.            ip address: "12.34.56.78"
306.            a stun server lookup: "stun:stun.server.com"
307.            a DNS name: "host:host.server.com"
308.        where fs.mydomain.com is a DNS A record-useful when fs is on
309.        a dynamic IP address, and uses a dynamic DNS updater.
310.        If unspecified, the bind_server_ip value is used.
311.        Used by: sofia.conf.xml dingaling.conf.xml
312.   -->
313.   <!--<X-PRE-PROCESS cmd="set" data="external_sip_ip=stun:stun.freeswitch.org"/>-->
314.   <!--<X-PRE-PROCESS cmd="set" data="external_rtp_ip=13.58.84.42"/>-->
315.   <X-PRE-PROCESS cmd="set" data="external_sip_ip=stun.services.mozilla.com"/>
316.  
317.   <!-- unroll-loops
318.        Used to turn on sip loopback unrolling.
319.   -->
320.   <X-PRE-PROCESS cmd="set" data="unroll_loops=true"/>
321.  
322.   <!-- outbound_caller_id and outbound_caller_name
323.        The caller ID telephone number we should use when calling out.
324.        Used by: conference.conf.xml and user directory for default
325.        outbound callerid name and number.
326.   -->
327.   <X-PRE-PROCESS cmd="set" data="outbound_caller_name=Guardhat-SCC"/>
328.   <X-PRE-PROCESS cmd="set" data="outbound_caller_id=0000000000"/>
329.  
330.   <!-- various debug and defaults -->
331.   <X-PRE-PROCESS cmd="set" data="call_debug=false"/>
332.   <X-PRE-PROCESS cmd="set" data="console_loglevel=info"/>
333.   <X-PRE-PROCESS cmd="set" data="default_areacode=248"/>
334.   <X-PRE-PROCESS cmd="set" data="default_country=US"/>
335.  
336.   <!-- if false or undefined, the destination number is included in presence NOTIFY dm:note.
337.        if true, the destination number is not included -->
338.   <X-PRE-PROCESS cmd="set" data="presence_privacy=false"/>
339.  
340.   <X-PRE-PROCESS cmd="set" data="au-ring=%(400,200,383,417);%(400,2000,383,417)"/>
341.   <X-PRE-PROCESS cmd="set" data="be-ring=%(1000,3000,425)"/>
342.   <X-PRE-PROCESS cmd="set" data="ca-ring=%(2000,4000,440,480)"/>
343.   <X-PRE-PROCESS cmd="set" data="cn-ring=%(1000,4000,450)"/>
344.   <X-PRE-PROCESS cmd="set" data="cy-ring=%(1500,3000,425)"/>
345.   <X-PRE-PROCESS cmd="set" data="cz-ring=%(1000,4000,425)"/>
346.   <X-PRE-PROCESS cmd="set" data="de-ring=%(1000,4000,425)"/>
347.   <X-PRE-PROCESS cmd="set" data="dk-ring=%(1000,4000,425)"/>
348.   <X-PRE-PROCESS cmd="set" data="dz-ring=%(1500,3500,425)"/>
349.   <X-PRE-PROCESS cmd="set" data="eg-ring=%(2000,1000,475,375)"/>
350.   <X-PRE-PROCESS cmd="set" data="es-ring=%(1500,3000,425)"/>
351.   <X-PRE-PROCESS cmd="set" data="fi-ring=%(1000,4000,425)"/>
352.   <X-PRE-PROCESS cmd="set" data="fr-ring=%(1500,3500,440)"/>
353.   <X-PRE-PROCESS cmd="set" data="hk-ring=%(400,200,440,480);%(400,3000,440,480)"/>
354.   <X-PRE-PROCESS cmd="set" data="hu-ring=%(1250,3750,425)"/>
355.   <X-PRE-PROCESS cmd="set" data="il-ring=%(1000,3000,400)"/>
356.   <X-PRE-PROCESS cmd="set" data="in-ring=%(400,200,425,375);%(400,2000,425,375)"/>
357.   <X-PRE-PROCESS cmd="set" data="jp-ring=%(1000,2000,420,380)"/>
358.   <X-PRE-PROCESS cmd="set" data="ko-ring=%(1000,2000,440,480)"/>
359.   <X-PRE-PROCESS cmd="set" data="pk-ring=%(1000,2000,400)"/>
360.   <X-PRE-PROCESS cmd="set" data="pl-ring=%(1000,4000,425)"/>
361.   <X-PRE-PROCESS cmd="set" data="ro-ring=%(1850,4150,475,425)"/>
362.   <X-PRE-PROCESS cmd="set" data="rs-ring=%(1000,4000,425)"/>
363.   <X-PRE-PROCESS cmd="set" data="ru-ring=%(800,3200,425)"/>
364.   <X-PRE-PROCESS cmd="set" data="sa-ring=%(1200,4600,425)"/>
365.   <X-PRE-PROCESS cmd="set" data="tr-ring=%(2000,4000,450)"/>
366.   <X-PRE-PROCESS cmd="set" data="uk-ring=%(400,200,400,450);%(400,2000,400,450)"/>
367.   <X-PRE-PROCESS cmd="set" data="us-ring=%(2000,4000,440,480)"/>
368.   <X-PRE-PROCESS cmd="set" data="bong-ring=v=-7;%(100,0,941.0,1477.0);v=-7;>=2;+=.1;%(1400,0,350,440)"/>
369.   <X-PRE-PROCESS cmd="set" data="beep=%(1000,0,640)"/>
370.   <X-PRE-PROCESS cmd="set" data="sit=%(274,0,913.8);%(274,0,1370.6);%(380,0,1776.7)"/>
371.  
372.   <!--
373.        Digits Dialed filter: (FS-6940)
374.  
375.        The digits stream may contain valid credit card numbers or social security numbers, These digit
376.        filters will allow you to make a valant effort to stamp out sensitive information for
377.        PCI/HIPPA compliance. (see xml_cdr dialed_digits)
378.  
379.        df_us_ssn   = US Social Security Number pattern
380.        df_us_luhn  = Visa, MasterCard, American Express, Diners Club, Discover and JCB
381.   -->
382.   <X-PRE-PROCESS cmd="set" data="df_us_ssn=(?!219099999|078051120)(?!666|000|9\d{2})\d{3}(?!00)\d{2}(?!0{4})\d{4}"/>
383.   <X-PRE-PROCESS cmd="set" data="df_luhn=?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|6(?:011|5[0-9]{2})[0-9]{12}|(?:2131|1800|35\d{3})\d{11}"/>
384.   <!-- change XX to X below to enable -->
385.   <XX-PRE-PROCESS cmd="set" data="digits_dialed_filter=(($${df_luhn})|($${df_us_ssn}))"/>
386.  
387.   <!--
388.       Setting up your default sip provider is easy.
389.       Below are some values that should work in most cases.
390.  
391.       These are for conf/directory/default/example.com.xml
392.   -->
393.   <X-PRE-PROCESS cmd="set" data="default_provider=example.com"/>
394.   <X-PRE-PROCESS cmd="set" data="default_provider_username=joeuser"/>
395.   <X-PRE-PROCESS cmd="set" data="default_provider_password=password"/>
396.   <X-PRE-PROCESS cmd="set" data="default_provider_from_domain=example.com"/>
397.   <!-- true or false -->
398.   <X-PRE-PROCESS cmd="set" data="default_provider_register=false"/>
399.   <X-PRE-PROCESS cmd="set" data="default_provider_contact=5000"/>
400.  
401.   <!--
402.      SIP and TLS settings. http://wiki.freeswitch.org/wiki/Tls
403.  
404.      valid options: sslv2,sslv3,sslv23,tlsv1,tlsv1.1,tlsv1.2
405.  
406.      default: tlsv1,tlsv1.1,tlsv1.2
407.   -->
408.   <X-PRE-PROCESS cmd="set" data="sip_tls_version=tlsv1,tlsv1.1,tlsv1.2"/>
409.  
410.   <!--
411.      TLS cipher suite: default ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH
412.  
413.      The actual ciphers supported will change per platform.
414.  
415.      openssl ciphers -v 'ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH'
416.  
417.      Will show you what is available in your verion of openssl.
418.   -->
419.   <X-PRE-PROCESS cmd="set" data="sip_tls_ciphers=ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH"/>
420.  
421.   <!-- Internal SIP Profile -->
422.   <X-PRE-PROCESS cmd="set" data="internal_auth_calls=true"/>
423.   <X-PRE-PROCESS cmd="set" data="internal_sip_port=5060"/>
424.   <X-PRE-PROCESS cmd="set" data="internal_tls_port=5061"/>
425.   <X-PRE-PROCESS cmd="set" data="internal_ssl_enable=true"/>
426.  
427.   <!-- External SIP Profile -->
428.   <X-PRE-PROCESS cmd="set" data="external_auth_calls=false"/>
429.   <X-PRE-PROCESS cmd="set" data="external_sip_port=5080"/>
430.   <X-PRE-PROCESS cmd="set" data="external_tls_port=5081"/>
431.   <X-PRE-PROCESS cmd="set" data="external_ssl_enable=true"/>
432.  
433.   <!-- Video Settings -->
434.   <!-- Setting the max bandwidth -->
435.   <X-PRE-PROCESS cmd="set" data="rtp_video_max_bandwidth_in=3mb"/>
436.   <X-PRE-PROCESS cmd="set" data="rtp_video_max_bandwidth_out=3mb"/>
437.  
438.   <!-- WebRTC Video -->
439.   <!-- Suppress CNG for WebRTC Audio -->
440.   <X-PRE-PROCESS cmd="set" data="suppress_cng=true"/>
441.   <!-- Enable liberal DTMF for those that can't get it right -->
442.   <X-PRE-PROCESS cmd="set" data="rtp_liberal_dtmf=true"/>
443.   <!-- Helps with WebRTC Audio -->
444.  
445.   <!-- Stock Video Avatars -->
446.   <X-PRE-PROCESS cmd="set" data="video_mute_png=$${images_dir}/default-mute.png"/>
447.   <X-PRE-PROCESS cmd="set" data="video_no_avatar_png=$${images_dir}/default-avatar.png"/>
448.  
449. </include>
450.