OpenBSC with Asterisk » History » Revision 5
Revision 4 (wirelesss, 12/01/2016 05:59 PM) → Revision 5/74 (wirelesss, 12/02/2016 12:27 PM)
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***Please be aware that LCR is obsolete and osmo-sip-connector should be used istead.***
Next link [[https://osmocom.org/projects/osmonitb/wiki/OsmoNITB_LCR]] gives short setup and run OsmoNITB and LCR with Asterisk.
This
A tutorial describes describing how to set up an [[OpenBSC]] network-in-a-box with Asterisk.
Following description contains just this part of the setup which is LCR specific. Wiki related to how to Build from source osmocom projects is available at:[[Build_from_Source]]. Asterisk
Required osmocom projects are:
* openbsc
* libosmocore
* libosmo-abis
lcr, mISDN and mISDNuser source codes are available at [[http://git.misdn.org]]
You can use git client to download the source.
** LCR
<pre>
cd ../../lcr
ln -s ../libosmocore/ .
ln -s ../openbsc/openbsc/ .
sh autogen.sh
./configure --prefix=/usr --with-asterisk --with-gsm-bs
make
sudo make install
cp chan_lcr.so /usr/lib/asterisk/modules/
</pre>
On Debian 6 chan_lcr module will **Please be loaded automatically on service restart, but in case it does not load
automatically, it is recommend adding the following line to your @/etc/modules.conf@
@load => chan_lcr.so@
** Configuring the system environment
<pre>
ldconfig
depmod –a
modprobe mISDN_core
modprobe mISDN_dsp
modprobe mISDN_l1loop nchannel=30 interfaces=2
</pre>
(Optional) Add following lines to your @/etc/modules@ file if you want your system to load the modules
automatically during boot
<pre>
mISDN_core
mISDN_dsp
mISDN_l1loop nchannel=30 interfaces=2
</pre>
* Configuring aware that LCR
* Configuring GSM-BS
<pre>
cd /usr/etc/lcr
nano interface.conf
</pre>
Uncomment GSM section where it says ‘gsm-bs’. It is an interface for GSM Base Station, in this case,
osmo-nitb. Now LCR will connect to OpenBSC using its MNCC socket.
Add ‘bridge ast’ at the bottom of the GSM section. Now all calls from the GSM Base Station will be
forwarded to Asterisk.
** Set up chan_lcr
<pre>
[ast]
remote asterisk
context from-lcr
earlyb no
tones yes
bridge GSM
</pre>
LCR will connect to Asterisk using chan_lcr using context name ‘from-lcr’. Calls from Asterisk will be
forwarded to OpenBSC. The phone numbers defined in hlr.sqlite3 will be used to identify mobiles within
the network. Please refer to the example Asterisk configuration given below.
** Remove unnecessary interfaces
Comment the last two interfaces named Ext obsolete and Int. We do not need these interfaces. Now you have
chan_lcr and GSM Base Station interface bridged to each other. All calls from one interface will osmo-sip-connector should be
redirected to the other. No more routing configurations are necessary at this point.
** Set up permissions
<pre>
nano options.conf
</pre>
Uncomment the following 2 lines. LCR will not connect to chan_lcr if you do not set the user and group it
runs on.
<pre>
socketuser asterisk
socketgroup asterisk
</pre>
** Configuring Asterisk
Following is a simple example of asterisk dialplan that can be used to route all calls from OpenBSC back
to OpenBSC. But a few extensions listed in the default dialplan are accessible. Add the following lines to
your @/etc/asterisk/extensions.conf@
<pre>
[from-lcr]
include => default
exten => _X.,1,Dial(LCR/ast/${EXTEN:0},60)
</pre>
In this case, I am adding the default Asterisk dialplan. In Asterisk, default dialplan provides some features
to test drive your network. You can call 1234 for information on Asterisk, and 600 for latency test. Please
refer to the configuration file for more extensions. You might want to remove the default dialplan after
you confirm that the network is working properly
istead.**
