diff --git a/asterisk/extensions.conf b/asterisk/extensions.conf
new file mode 100644
index 0000000..018a4cd
--- /dev/null
+++ b/asterisk/extensions.conf
@@ -0,0 +1,38 @@
+[+441234567890]
+    ; Redirect incoming calls from trunk with context +441234567890 to internal extension 0.
+    exten => _+X.,1,Goto(internal,0,1)
+    
+[outgoing]
+    ; Redirect all calls entering this context via SIP trunk "twilio".
+    exten => _X.,1,Dial(SIP/twilio/+${EXTEN})
+    same => n,Hangup
+
+
+[internal]
+    ; Dialplan for extension 1000.
+    ; Dial SIP user 1000. Timeout after 10 seconds.
+    exten => 1000,1,Dial(SIP/1000,10)
+    same => n,VoiceMail(${EXTEN})
+    same => n,Hangup
+    
+    ; Dialplan for extension 1001.
+    exten => 1001,1,Dial(SIP/1001,10)
+    same => n,VoiceMail(${EXTEN})
+    same => n,Hangup
+
+
+    ; Dialgroup "everyone" at extension 0 to ring mulitple extensions. 
+    exten => 0,1,Set(DIALGROUP(everyone,add)=SIP/1000)
+    same => n,Set(DIALGROUP(everyone,add)=SIP/1001)
+    same => n,Dial(${DIALGROUP(everyone)},10)
+    same => n,VoiceMail(${EXTEN})
+    same => n,Hangup
+
+
+    ; Dialplans for redirecting calls to outgoing context.
+    ; Redirect international calls in format 00441234567890.
+    exten => _00X.,1,Goto(outgoing,${EXTEN:2},1)
+    ; Redirect international calls in format +441234567890.
+    exten => _+X.,1,Goto(outgoing,${EXTEN:1},1)
+    ; Redirect outgoing national calls in format 01234567890.
+    exten => _0ZX.,1,Goto(outgoing,44${EXTEN:1},1)
\ No newline at end of file
diff --git a/asterisk/modules.conf b/asterisk/modules.conf
new file mode 100644
index 0000000..c008fd9
--- /dev/null
+++ b/asterisk/modules.conf
@@ -0,0 +1,2 @@
+[modules]
+    autoload=yes
\ No newline at end of file
diff --git a/asterisk/sip.conf b/asterisk/sip.conf
new file mode 100644
index 0000000..037ec5f
--- /dev/null
+++ b/asterisk/sip.conf
@@ -0,0 +1,35 @@
+[general]
+    ; Default context for incoming calls.
+    context=public
+    ; Determines whether a phone is available before accepting call.
+    qualify=yes
+
+; Settings common to all trunks.
+[trunk](!)
+    type=peer
+    nat=no
+    qualify=yes
+    insecure=port,invite
+    dtmfmode=rfc2833
+    allow=ulaw,alaw,G729
+
+; Settings common to all internal extensions.
+[internal](!)
+    context=internal
+    type=friend
+    host=dynamic
+    allow=ulaw,alaw,G729
+
+
+; Twilio trunk.
+[twilio](trunk)
+    context=+441234567890
+    fromuser=+441234567890
+    host=example.pstn.ie1.twilio.com
+
+; Internal extensions.
+[1000](internal)
+    secret=supersecurepassword
+
+[1001](internal)
+    secret=supersecurepassword
diff --git a/asterisk/voicemail.conf b/asterisk/voicemail.conf
new file mode 100644
index 0000000..96affc6
--- /dev/null
+++ b/asterisk/voicemail.conf
@@ -0,0 +1,12 @@
+[general]
+    format=wav
+    maxsilence=10
+    maxmessage=180
+
+[default]
+    ; Voicemail inbox for missed dialgroup calls.
+    0 => 0000,0,test@example.com
+
+    ; Voicemail inboxes for individual extensions.
+    1000 => 0000,1000,test@example.com
+    1001 => 0000,1001,test@example.com
\ No newline at end of file
diff --git a/extensions.conf b/extensions.conf
deleted file mode 100644
index 36f6fd5..0000000
--- a/extensions.conf
+++ /dev/null
@@ -1,12 +0,0 @@
-[general]
-autofallthrough=yes
-
-[globals]
-
-[nexmo-trunk]
-exten => _X.,1,Dial(SIP/${EXTEN},30)
-
-[internal]
-exten => 666,1,Dial(SIP/666)
-exten => 777,1,Dial(SIP/777)
-exten => _X.,1,Dial(SIP/${EXTEN}@nexmo-<phone_number>)
\ No newline at end of file
diff --git a/modules.conf b/modules.conf
deleted file mode 100644
index c02e8ff..0000000
--- a/modules.conf
+++ /dev/null
@@ -1,2 +0,0 @@
-[modules]
-autoload=yes
\ No newline at end of file
diff --git a/nexmo.conf b/nexmo.conf
deleted file mode 100644
index 76c1892..0000000
--- a/nexmo.conf
+++ /dev/null
@@ -1,51 +0,0 @@
-[general]
-context=nexmo-trunk
-register => <username>:<api_key>@sip.nexmo.com
-nat=yes
-
-[nexmo]
-context=nexmo-trunk
-fromdomain=sip.nexmo.com
-type=peer
-insecure=port,invite
-nat=no
-dtmfmode=rfc2833
-allow=ulaw
-allow=alaw
-allow=G729
-
-[nexmo-sip-01](nexmo)
-host=5.10.112.121
-
-[nexmo-sip-02](nexmo)
-host=5.10.112.122
-
-[nexmo-sip-03](nexmo)
-host=119.81.44.6
-
-[nexmo-sip-04](nexmo)
-host=119.81.44.7
-
-[nexmo-sip-05](nexmo)
-host=169.60.141.29
-
-[nexmo-sip-06](nexmo)
-host=169.60.141.30
-
-
-[nexmo-<phone_number>]
-context=nexmo-trunk
-username=<username>
-defaultuser=<username>
-secret=<api_key>
-fromuser=<phone_number>
-fromdomain=sip.nexmo.com
-host=sip.nexmo.com
-type=peer
-insecure=very
-qualify=yes
-nat=no
-dtmfmode=rfc2833
-allow=ulaw
-allow=alaw
-allow=G729
\ No newline at end of file
diff --git a/sip.conf b/sip.conf
deleted file mode 100644
index 59958ba..0000000
--- a/sip.conf
+++ /dev/null
@@ -1,13 +0,0 @@
-#include nexmo.conf
-
-[666]
-type=friend
-host=dynamic
-secret=123
-context=internal
-
-[777]
-type=friend
-host=dynamic
-secret=456
-context=internal
\ No newline at end of file