...
Next, it is needed to set layer3 parameters and PBX specific parameters. It is stored in /etc/asterisk/zapata.conf. Use same language code as above. Use swtichtype ISDN because it has best support within asterisk. Qsig is not implemented well. Select signalling (either cpe for end device and net for master device). In most situation, your asterisk gateway will act as CPE because your telecomunication operator act as network device (master). Dialplan is unknown, it means that there will be no automatic country or PBX prefixes for calling and we will do this in dialplan (better solution). Echoparaeters are needed for echocancelation to work. But it can be time consuming process to find source of echo and cancelate it. And you can never be sure that it will not appear in some calls. See http://www.voip-info.org/wiki/view/Asterisk+echo+cancellation&view_comment_id=13700 for more informations. Immediate means if calling to your asterisk will be routed to called number into dialplan. Next, we have to setup calling groups. In this scenario, we have only one calling group which spans all available channels on card. We can group only some of them or more cards together. Any call to your Asterisk box will be routed into fpstn context (see above).
h.3 zapata.conf
| Code Block |
|---|
[channels]
language=xx
switchtype = euroisdn
signalling = pri_cpe
pridialplan = unknown
prilocaldialplan = unknown
echocancel=64
echotraining = 150
echocancelwhenbridged=yes
;txgain=-4
;rxgain=-4
immediate=no
group = 1
context = fpstn
channel => 1-15,17-30
acountcode = fpstn
|
Next, we have to setup SIP side of our gateway. We will do this in /etc/asterisk/sip.conf. We will not allow unauthenticated clients (we will route them into context guest, see above). Set your realm and domain to something usefull which should be unique. Putting your real domain there is realy good point of start. But remember, this domain and realm setting has to corespond to settings in client, see above. Only opensource codecs are enabled by default. If you buy or own g.729 codec, you can enable it. Again, set language to fit your needs. Localnets are defined to better recognisation of NAT. Lines starting with jb are turning on jitterbuffer which is good to enable. Next, we define phones which we will use. In example, we use 3-digit dialplan and we are starting with number 200. Define next sip clients to fit your needs. It is good if username corespond with peer name (name in []). It is possible to use database for storing SIP users, which is better for bigger systems, but it is not scope of this document. See http://www.voip-info.org/wiki/view/Asterisk+RealTime+Sip or http://www.sineapps.com/news.php?rssid=1105 for more informations.
sip.conf
| Code Block |
|---|
[general] context=guest ; Default context for incoming calls (non authenticated) realm=somecompany.com domain=somecompany.com disallow=all ; First disallow all codecs ;allow=g729 allow=gsm allow=alaw allow=ulaw language=xx ; Default language setting for all users/peers localnet=192.168.0.0/255.255.0.0; All RFC 1918 addresses are local networks localnet=10.0.0.0/255.0.0.0 ; Also RFC1918 localnet=172.16.0.0/12 ; Another RFC1918 with CIDR notation localnet=169.254.0.0/255.255.0.0 ;Zero conf local network jbenable=yes jbforce=yes jbimpl = fixed [200] username=200 secret=somesecret200 type=friend host=dynamic context=sip [201] username=201 secret=somesecret201 type=friend host=dynamic context=sip [...] ... ... |
h.3 extensions.conf
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