DUNDi configuration

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In order to keep our config files clean, we edited the *_custom.conf files, where possible.

Configuring DUNDi

For making DUNDi work, you have to edit three Asterisk configuration files. The three files are dundi.conf, iax.conf, and extensions.conf. These are in /etc/asterisk/ on the Trixbox.

  • dundi.conf controls peer authentication.
  • iax.conf is our transport protocol.
  • extensions.conf contains your dialplans.

This example connects three peers, PBX1 , PBX2 and PBX3.


First edit iax.conf. Add the following lines, except for any that are duplicated in the [general] section:

dbsecret=dundi/secret ; the password used by others to make an IAX connection to this machine.
context=from-internal ; this context must not be changed when using Trixbox.
regcontext=d_adv      ; used for registration of connected phones.


Now edit dundi.conf. The default file is well commented and has lots of examples--you'll find definitions of all the directives in there. This is where your mapping contexts are defined, which follow this format:

dundi_context => local_context,weight,technology,destination,[options]

The following configuration creates two DUNDi mapping contexts:

The General section:

entityid=00:0C:29:97:0B:98 ; This is the mac address of eth0
  • entityid is optional. When not specified, the MAC-address of the first networkcard is used.
  • ttl specifies the max. number of peer-redirects are allowed.
  • cachetime is in seconds.
  • autokill speeds up the requests when a peer is not available.
organization=Rubzzzz, Inc.

The mappings tell us what to advertise in the DUNDi network. N.B. each is 1 long line in the config file.

priv => dundi-priv-local-custom,0,IAX2,koekje:${SECRET}@${NUMBER},nounsolicited,nocomunsolicit,nopartial

The peers each have a section with the MAC-address of the peer as name.

[00:0C:29:A7:E0:73] ; MAC address of TrixBox2 eth0
model = symmetric
host =
inkey = dundi
outkey = dundi
include = priv
permit = priv
qualify = yes
;[00:0C:29:D2:D8:EC] ; MAC address of TrixBox3 eth0
;model = symmetric
;host =
;inkey = dundi
;outkey = dundi
;include = priv
;permit = priv
;qualify = yes

You need to create RSA authentication keys for your server. You may name them anything you want; a good naming convention is to use your server's fully-qualified domain name. In the above example we used the same key for all PBX's. Create keys with these commands:

# cd /var/lib/asterisk/keys
# /usr/sbin/astgenkey -n myhost.mynet.com

This creates two keys: myhost.mynet.com.pub and myhost.mynet.com.key. The public key, myhost.mynet.com.pub, must be distributed to all servers you are peering with. (in the /var/lib/asterisk/keys directory) Post it on your Web site if you like. The private key is unencrypted, and like all private encryption keys must be guarded carefully. Then the res_crypto.so line interface:

# asterisk -r
asterisk1*CLI># reload res_crypto.so
asterisk1*CLI># reload pbx_dundi.so

From here you can also run the command show keys to see all of your RSA keys.

dundi/secret is an encryption key automatically generated by Asterisk. You may view this key by running the database show command from the Asterisk CLI. N.B. this key will change periodically (default 3600 sec)


Finally, edit extensions_custom.conf; this is where you define what numbers to share and what to do with them. Telephone numbers must follow this format:

country_code area_code prefix number

N.B. make sure you leave the lines at the beginning (2 #include lines) and the end (the [from-internal-custom] section) the same if you're using Trixbox.

; This file contains example extensions_custom.conf entries.
; extensions_custom.conf should be used to include customizations
; to AMP's Asterisk dialplan.
; All custom context should contain the string 'custom' in it's name 
; Extensions in AMP have access to the 'from-internal' context.
; The context 'from-internal-custom' is included in 'from-internal' by default
#include extensions_trixbox.conf
#include extensions_hud.conf
; Goto the extension number. Check the local context first, followed by lookup
; dundi-priv-lookup is a pointer to the switch statement which will look for
; extensions on other machines. This allows the convergence of multiple
; Asterisk servers with different extension number blocks. Very cool!
exten => s,1,Goto(${ARG1},1)
include => dundi-priv-local-custom
include => dundi-priv-lookup-custom
; we only have extensions 1300 -> 1399 locally
exten => _13XX,1,Macro(dial,${EXTEN})

; Check our private peers for the exten #. Search 'priv' dundi context
switch => DUNDi/priv

; when we get an incoming call from a private peer, it gets directed here
include => dundi-priv-local-custom
; Outgoing Calls Contexts
; For extensions starting with 1000 -> 1099 and 1600 -> 1699 do a dundi-lookup (private extens)
exten => _1[06]XX,1,Macro(dundi-lookup-custom,${EXTEN})
include => local-custom
include => from-internal-trixbox

SIP registration

Add the following to sip.conf:


Once the phones, in this example 201 and 202 register with the PBX, a context of [sipregistration] appears and can be shown in the Asterisk CLI:

asterisk1*CLI> show dialplan sipregistration
[ Context 'sipregistration' created by 'SIP' ]
  '201' =>          1. Noop(201)                                  [SIP]
  '202' =>          1. Noop(202)                                  [SIP]
-= 2 extensions (2 priorities) in 1 context. =-

DUNDi CLI-checks


asterisk1*CLI> dundi lookup 1001@priv
    from 00:0c:29:d2:d8:ec, expires in 5 s
DUNDi lookup completed in 89 ms


asterisk1*CLI> dundi lookup 1301@priv
    from 00:0c:29:97:0b:98, expires in 5 s
DUNDi lookup completed in 52 ms


asterisk1*CLI> dundi lookup 1601@priv
 1.     0 IAX2/priv:cZzQREFhaxEiS5w22f2Oag@ (EXISTS|NOUNSLCTD|NOCOMUNSLTD)
    from 00:0c:29:a7:e0:73, expires in 5 s
DUNDi lookup completed in 44 ms