Initial Asterisk configuration.

extensions.conf

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+[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>)

modules.conf

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+[modules]
+autoload=yes

nexmo.conf

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+[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

sip.conf

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+#include nexmo.conf
+
+[666]
+type=friend
+host=dynamic
+secret=123
+context=internal
+
+[777]
+type=friend
+host=dynamic
+secret=456
+context=internal