Peer Asterisk and Switchvox systems together to allow users in different offices use internal extensions.
Asterisk Configuration
Asterisk has been configured via FreePBX.
# cat /etc/asterisk/iax_additional.conf [switchvox] host=switchvox.example.com username=asterisk secret=passwd type=friend qualify=yes qualifyfreqok=25000 transfer=no trunk=yes auth=md5 encryption=yes context=from-internal
# cat /etc/asterisk/iax_general_additional.conf mailboxdetail=yes tos=ef disallow=all allow=alaw allow=ulaw allow=gsm requirecalltoken=no calltokenoptional=0.0.0.0/0.0.0.0 codecpriority=host delayreject=yes language=uk jitterbuffer=no minregexpire=60 maxregexpire=3600
pbx*CLI> iax2 show peers Name/Username Host Mask Port Status switchvox/aster 54.X.Y.Z (S) 255.255.255.255 4569 (T) (E) OK (35 ms) 1 iax2 peers [1 online, 0 offline, 0 unmonitored]
Switchvox Configuration
Provider Information
IAX Provider Name: AsteriskPBX
IAX Provider Label: asterisk
Your Account ID: switchvox
Your Password: passwd
Hostname: asterisk.example.com
Callback Extension: N/A
Incoming Authentication Type: MD5
Peer Settings
Host Type: Peer
Apply Incoming Call Rules to Provider: NO
Host is a Switchvox PBX: NO
Passthrough Outgoing Call Rules: Internal (Any local extension)
Connection Settings
Qualify Hosts: YES
Enable Trunbking: YES
Use RSA Authentication of Outgoing: NO
Call Settings
Audio Codecs: ULAW, ALAW, GSM
Enable Jutterbuffer: NO
Firewall
Make sure Asterisk and Switchvox servers can reach each other via UDP port 4569.
Troubleshooting
CallToken Support Required
To fix the following error:
ERROR[2153] chan_iax2.c: Call rejected, CallToken Support required. If unexpected, resolve by placing address 54.X.Y.Z in the calltokenoptional list or setting user switchvox requirecalltoken=no
Add the lines below to /etc/asterisk/iax_general_additional.conf:
requirecalltoken=no calltokenoptional=0.0.0.0/0.0.0.0
Incoming Call is Unencrypted
If you have a forceencryption=yes set on Asterisk, you may find yourself into this trouble:
NOTICE[2152] chan_iax2.c: Call Terminated, Incoming call is unencrypted while force encrypt is enabled.
References
http://kb.digium.com/articles/Configuration/Peering-Switchvox-and-Asterisk-using-IAX