OsmoNITB LCR » History » Version 16
wirelesss, 12/02/2016 10:06 AM
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2 | 15 | laforge | h2. How to run OsmoNITB with Asterisk and LCR |
3 | 14 | laforge | |
4 | 15 | laforge | This is a short walk-through to setup [[OsmoNITB]] and LCR with Asterisk. |
5 | 14 | laforge | |
6 | 1 | In the end we'll have a working setup to route calls from our BTS to |
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7 | 14 | laforge | the PTSN via [[VoIP]]. |
8 | 1 | ||
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11 | 14 | laforge | h3. Prerequisites |
12 | |||
13 | * [[OpenBSC]] equipment (BTS, E1 Card) |
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14 | ** We're using a Siemens BS11 microBTS and a Cologne Chips E1 PCI card |
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15 | 16 | wirelesss | |
16 | * get source codes of the following projects according to [https://osmocom.org/projects/cellular-infrastructure/wiki/Build_from_source]: |
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17 | ** libosmocore |
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18 | ** openbsc |
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19 | |||
20 | 14 | laforge | * LCR from git repository |
21 | *** git-clone git://git.misdn.org/lcr.git/ |
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22 | * A working kernel for your Linux system |
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23 | 1 | *** Support for your E1 card |
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24 | 14 | laforge | *** mISDN's l1loop module (mISDN_l1loop.ko) |
25 | *** mISDN's DSP module (mISDN_dsp.ko) |
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26 | *** You can obtain a working package for Debian at https://brezn.muc.ccc.de/~codec/openbsc/ |
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27 | ***** Supports cards from Cologne Chips and Junghanns |
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28 | 16 | wirelesss | * libgsm and header files (libgsm / libgsm-dev on Debian) |
29 | 14 | laforge | * A working Asterisk setup |
30 | * Original howto from https://brezn.muc.ccc.de/~codec/openbsc/howto.txt |
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31 | 1 | ||
32 | Alternatively you can download a snapshot of the source codes, which have been tested: http://www.linux-call-router.de/download/ (go to the latest lcr-* subdirectory) |
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33 | |||
34 | |||
35 | h3. Installation |
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36 | |||
37 | 16 | wirelesss | Build the following projects according to [https://osmocom.org/projects/cellular-infrastructure/wiki/Build_from_source]: |
38 | ** libosmocore |
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39 | ** openbsc @./configure --prefix=/opt/openbsc@ |
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40 | 1 | ||
41 | 16 | wirelesss | We assume the following: |
42 | 1 | * Layout of your working directory: |
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43 | 16 | wirelesss | *** libosmocore/ |
44 | *** openbsc/ |
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45 | 9 | *** lcr/ - checkout from LCR repo |
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46 | 1 | * Installation directories: |
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47 | *** /opt/openbsc for [[OpenBSC]] |
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48 | 14 | laforge | *** /opt/lcr for LCR |
49 | 9 | ||
50 | 1 | ||
51 | 14 | laforge | After that we're going for LCR: |
52 | 9 | <pre> |
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53 | 14 | laforge | $ cd ../../lcr |
54 | 9 | </pre> |
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55 | 14 | laforge | |
56 | 16 | wirelesss | First of all, we have to link the source directory of [[OpenBSC]] and libosmocore in the lcr-Directory: |
57 | 1 | <pre> |
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58 | $ ln -s ../libosmocore/ . |
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59 | 14 | laforge | $ ln -s ../openbsc/openbsc/ . |
60 | 1 | </pre> |
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61 | 14 | laforge | |
62 | 9 | Now we can go on with compiling LCR. Unfortunately, due to changes in [[OpenBSC]], we have to install a patch |
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63 | 1 | for LCR, until the programmer of LCR will include this patch in the current version. |
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64 | 14 | laforge | The patch is attached to this document. |
65 | 1 | <pre> |
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66 | $ sh autogen.sh |
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67 | $ git-apply --verbose lcrOpenBSC.patch |
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68 | $ ./configure --prefix=/opt/lcr --with-asterisk --with-gsm-bs |
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69 | 9 | $ make |
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70 | 14 | laforge | $ sudo make install |
71 | 2 | </pre> |
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72 | 1 | ||
73 | 14 | laforge | and now we can copy the module into the modules' directory of Asterisk: |
74 | 1 | <pre> |
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75 | 14 | laforge | $ sudo cp chan_lcr.so /usr/lib/asterisk/modules/ |
76 | 2 | </pre> |
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77 | 14 | laforge | |
78 | |||
79 | h3. LCR configuration |
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80 | |||
81 | *1. gsm in options.conf* |
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82 | 1 | ||
83 | 14 | laforge | The gsm option in /usr/local/lcr/options.conf needs to be activated. This can be |
84 | simply done by adding 'gsm' as a single line to the file. |
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85 | 1 | ||
86 | 14 | laforge | Because it is a good idea to start Asterisk without root's privileges, we want to add these lines, too: |
87 | 2 | <pre> |
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88 | socketuser asterisk |
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89 | 14 | laforge | socketgroup asterisk |
90 | 2 | </pre> |
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91 | 14 | laforge | |
92 | *2. GSM interface in interface.conf* |
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93 | 1 | ||
94 | 2 | /usr/local/lcr/interface.conf holds an example for a GSM interface. Remove the comments |
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95 | 1 | and use the example as is. |
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96 | 14 | laforge | |
97 | *3. gsm.conf* |
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98 | 2 | ||
99 | 9 | Enable the debugging option in /usr/local/lcr/gsm.conf. We also need 2 mISDN loopback interfaces. |
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100 | 14 | laforge | Create them with |
101 | 1 | <pre> |
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102 | 14 | laforge | $ sudo modprobe mISDN_l1loop pri=1 nchannel=30 |
103 | 9 | </pre> |
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104 | 2 | You can check for the interfaces names with the misdn_info tool. All the default settings |
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105 | 14 | laforge | should work in a BS11 setup. |
106 | 1 | You have just to give a value for 'config' and 'hlr', with the full path of your [[OpenBSC]] configuration |
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107 | file and HLR-!DataBase. |
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108 | 14 | laforge | |
109 | *4. Routing* |
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110 | 3 | ||
111 | 14 | laforge | We route all our calls to to asterisk at the moment, as we only have outgoing connectivity via IAX/SIP in our setup. |
112 | 1 | <pre> |
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113 | [main] |
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114 | 14 | laforge | interface=GSM : remote application=asterisk context=btsctrl |
115 | 3 | </pre> |
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116 | |||
117 | Calls will go to the context btsctrl in Asterisk. |
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118 | |||
119 | 14 | laforge | |
120 | |||
121 | h3. Asterisk configuration |
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122 | 3 | ||
123 | Our setup connects to an external Asterisk via SIP - as we don't have a second ISDN interface. |
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124 | |||
125 | chan_lcr for Asterisk comes with LCR (compiled with --with-asterisk). You only need to load the |
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126 | channel driver and maybe check the permissions of the LCR socket (/var/tmp/lcr.socket) - Asterisk |
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127 | on Debian uses a Set UID wrapper. |
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128 | |||
129 | 14 | laforge | To load chan_lcr automagically on startup add the following to your modules.conf: |
130 | 3 | <pre> |
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131 | 14 | laforge | load => chan_lcr.so |
132 | 3 | </pre> |
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133 | 14 | laforge | |
134 | We've created an exclusive context in extensions.conf for [[OpenBSC]]/LCR: |
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135 | 4 | <pre> |
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136 | 10 | jolly | [btsctrl] |
137 | exten => _02X.,1,GotoIf($[${CALLERID(name)} != ""]?4) |
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138 | exten => _02X.,2,Set(CALLIDORIG=${CALLERID(num)}) |
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139 | exten => _02X.,3,Set(CALLERID(num)=02${CALLIDORIG}) |
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140 | 14 | laforge | exten => _02X.,4,Dial(LCR/GSM/${EXTEN:2},120) |
141 | 4 | </pre> |
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142 | |||
143 | 14 | laforge | |
144 | |||
145 | h3. Running [[OpenBSC]]/LCR and Asterisk |
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146 | 4 | ||
147 | Now we're ready to start with our GSM network. |
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148 | 14 | laforge | Boot up the BS11 and start LCR with |
149 | 4 | <pre> |
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150 | 14 | laforge | $ sudo /opt/lcr/sbin/lcr start |
151 | 4 | </pre> |
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152 | |||
153 | You can also use 'fork' instead of 'start' to run LCR in daemon mode, |
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154 | but I'd rather go with fork AFTER you made you first successful call. (; |
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155 | |||
156 | Now start Asterisk. It should connect to LCR right after startup. You |
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157 | 14 | laforge | can check this by running |
158 | 4 | <pre> |
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159 | 14 | laforge | $ sudo /opt/lcr/bin/lcradmin state |
160 | 4 | </pre> |
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161 | |||
162 | 14 | laforge | The UI should show |
163 | 4 | <pre> |
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164 | 14 | laforge | Remote: asterisk |
165 | 4 | </pre> |
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166 | in the upper left part. |
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167 | |||
168 | Connect your phone and make your call(s). |
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169 | |||
170 | 14 | laforge | |
171 | |||
172 | h3. Troubleshooting === |
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173 | 4 | Phones unable to connect ==== |
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174 | On the first run I had some problems with connecting my phones as |
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175 | the registration just timed out. I fixed this by starting over with a fresh HLR. |
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176 | 14 | laforge | |
177 | |||
178 | h4. The call routing fails (somewhere) |
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179 | 1 | ||
180 | Most problems occured within Asterisk for me as neither IAX2 or SIP was working. |
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181 | This was just some kind of problem within the configuration. |
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182 | |||
183 | I can provide a working dialplan and SIP configuration if you need it. |
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184 | 14 | laforge | |
185 | |||
186 | h4. Can't see the network |
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187 | 1 | ||
188 | This was either related to the phone (a restart fixed it) or the BS11. After the |
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189 | first start I sometimes had to hardreset (as in reboot) the BS11. |