Connect Asterisk Server via the TDMoE
Contents
Abstract
It is possible to use Alvis-CSI together with the RtpBridge Basic as a remote Asterisk E1/T1 PRI Interface Board. That case all you need is configure the RtpBridge with the N64 Streaming mode allows to send a full E1/T1 frame over the Ethernet to a remote host.
Check the site on the Releases soon!!!
Software Drivers
On the remote Asterisk system (could be Intel based or Embedded - no matter) all that needed is to build/install/setup a special DAHDI driver that will understand the 1K streaming packets sent by the RtpBridge.
Advantages of this solution
- It is possible to connect not only to the Asterisk, but to other GPL softswitches like Yate or FreeSwitch. All what is needed is write a simple socket interface to be able to read/write E1 buffers.
- No need to think about the E1 Layer1 configuration - RtpBridge has a very simple configuration interface.
- Ability to intercept any timeslots and send them for the Analysis to some tools like the WireShark.
- High Scalability: Need more E1 links? Install one more Alvis-CSI on your net and that's all!
- Asterisk-side is a fully GPL, no standards violations - Remote Drivers are provided for free on the GPL basis!
- No restrictions caused by the Embedded Systems - it is possible to build a full Call Centers etc..
- Low ARM CPU usage - Because RtpBridge is highly uses the powerful DSP Core of the SoC, 4xE1 spans is not a problem to send/receive even on the DM644x!
- It is possible to integrate LEC.
- HDLC is done on the DSP side, no load of the ARM CPU.
How to setup Asterisk
My OS was CentOS 5.3
- Install or build packages: libtonezone, libtonezone-devel, libpri, libpri-devel, ncurses, ncurses-devel, libxml2, libxml2-devel
yum didn't helped me with libtonezone so I used:
http://packages.asterisk.org/centos/5/current/i386/RPMS/libtonezone-2.4.0-2_centos5.i386.rpm
http://packages.asterisk.org/centos/5/current/i386/RPMS/libtonezone-devel-2.4.0-2_centos5.i386.rpm
http://packages.asterisk.org/centos/5/current/i386/RPMS/libpri-1.4.11.5-1_centos5.i386.rpm
http://packages.asterisk.org/centos/5/current/i386/RPMS/libpri-devel-1.4.11.5-1_centos5.i386.rpm
rpm -i libtonezone-2.4.0-2_centos5.i386.rpm rpm -i libtonezone-devel-2.4.0-2_centos5.i386.rpm rpm -i libpri-1.4.11.5-1_centos5.i386.rpm rpm -i libpri-devel-1.4.11.5-1_centos5.i386.rpm
I uses yum to install some other:
yum install ncurses yum install ncurses-devel yum install libxml2 yum install libxml2-devel
Also for correct building you should have kernel headers, kernel sources and build tools:
yum install gcc-c++ kernel-headers kernel-devel
- Build and install dahdi driver from from http://packages.odints.com/csirep/alvis4ext/otxdahdin64_package_2.4.1.tgz drivers package:
make make install depmod
To make you also may need to take
dahdi/include/dahdi/kernel.h
from
dahdi-linux-2.4.1.2.tar.gz
If make says "You do not appear to have the sources for the xxx kernel installed" then you need install correct kernel-devel package. For example:
# uname -r 2.6.18-92.el5
You need to install
rpm -i kernel-devel-2.6.18-92.el5.i686.rpm
You have to uninstall wrong package first
rpm -e kernel-devel-2.6.18-238.5.1.el5.i686.rpm
After that you have:
/usr/src/kernels/2.6.18-92.el5-i686
- Build and install dahdi-tools from http://packages.odints.com/csirep/alvis4ext/otxdahdin64_package_2.4.1.tgz drivers package:
./configure make make install
- Build and install Asterisk, I used asterisk-1.6.2.18 :
You should configure asterisk with libpri, libtonezone and dahdi support:
./configure --with-pri --with-tonezone --with-dahdi
Copy 'asterisk/res_n64conf.c' to folder 'res' in you asterisk sources
Ensure that you select chan_dahdi channel driver in configuration:
make menuconfig
- Build and install Asterisk:
make make install make config make samples
- Copy file n64.conf from asterisk folder of this package to asterisk configuration folder (typical /etc/asterisk)
Configure in n64.conf 2 spans:
;Span0 configuration [0] mac=A1:A2:A3:A4:A5:A6 if=eth0 ch=0 ;Span1 configuration [1] mac=A1:A2:A3:A4:A5:A6 if=eth0 ch=1
Where A1:A2:A3:A4:A5:A6 is Alvis-CSI MAC address
- Configure dahdi, in /etc/dahdi/system.conf add 2 spans:
span=1,1,0,ccs,hdb3,crc4 bchan=1-15,17-31 dchan=16 span=2,0,0,ccs,hdb3,crc4 bchan=32-46,48-62 dchan=47
- Configure PRI
In /etc/asterisk/chan_dahdi.conf add:
switchtype=qsig group=1 signalling=pri_net channel =>1-15,17-31 switchtype=qsig group=2 signalling=pri_cpe channel =>32-46,48-62
- Configure rtpbridge
Intsall rtpbridge, I used http://packages.odints.com/csirep/otx/RPMS.arm/rtpbridge-1.10.1-1.arm_v5t_le.rpm
Add N64 span configuration to /root/cfg:
connect tdmli:0:raw n64:0:eth0:B1:B2:B3:B4:B5:B6 connect tdmli:1:raw n64:1:eth0:B1:B2:B3:B4:B5:B6 connect n64:0:eth0 tdmli:0:raw connect n64:1:eth0 tdmli:1:raw
Where B1:B2:B3:B4:B5:B6 is Asterisk host MAC address
- Run Asterisk
asterisk -c
And check PRI is up, make sure that Alvis-CSI has E1 loop cable from li0 to li1
*CLI> pri show spans PRI span 1/0: Provisioned, Up, Active PRI span 2/0: Provisioned, Up, Active
To check statistics of otxdahdin64 you can use:
cat /proc/otxdahdin64/spans/0 cat /proc/otxdahdin64/spans/1
If dahdi_сfg fails
# dahdi_cfg DAHDI_SPANCONFIG failed on span 1: Invalid argument (22)
Do the following
rmmod otxdahdin64 rmmod xpp_usb rmmod xpp rmmod dahdi_dummy rmmod dahdi
Type the name of a command and press enter to execute it, or help for assistance.
How to setup YATE
Let say we need to connect Asterisk and YATE via PRI link. And have the following scheme:
SIP phone -> Asterisk ->PRI[Alvis with OtxRtpBridge] ->PRI->YATE->Answering machine
Let's configure it step by step
- First configure SIP phone. Add to sip.conf:
[123456] type=friend ; Friends place calls and receive calls context=from-sip ; Context for incoming calls from this user secret=blah
Configure SIP phone: set Asterisk address, user name = 123456, password = blah
- Configure Asterisk as described above but do not configure span2
Add to /etc/asterisk/extensions.conf:
[from-sip] exten =>99,1,Dial(DAHDI/1/99)
To send call to number 99 to PRI
- Configure OtxRtpBridge, /root/cfg:
connect tdmli:0:raw n64:0:eth0:00:0C:29:BB:18:92 connect n64:0:eth0 tdmli:0:raw connect tdmli:1:raw n64:1:eth0:00:26:55:50:7B:52 connect n64:1:eth0 tdmli:1:raw connect tdm:li1:ts16:slin rtp:127.0.0.1:5000:6002:slin connect rtp:127.0.0.1:5000:6004:g711u tdm:li1:ts16:g711u
00:0C:29:BB:18:92 - is Asterisk Box Mac
00:26:55:50:7B:52 - is YATE Box Mac
The last two lines is related to Hdlc plugin which have to work with OtxRtbBridge because YATE do not do HDLC stufffing. So we have to use hdlc plugin to stuff/destuff hdlc frames from YATE
- Configure Hdlc plugin, HdlcUtil.conf:
connect rtp:127.0.0.1:6002:6004:5000 hdlc:192.168.33.49:20000:10049
192.168.33.49 - is YATE box IP address
- Build wanpipe
tar xzf wanpipe-3.3.14.11.tgz cd wanpipe-3.3.14.11 make make install
- Build YATE, download it from ...{LINK}
./configure make install
- Configure YATE
Configure /usr/local/etc/yate/ysigchan.conf: Make sure you have two sections [general] and [trunk1] In [trunk1]:
type=isdn-pri-cpe switchtype=qsig sig=tdm1 offset=0 rxunderrun=0 channelsync=300 channellock=10000 format=alaw print-messages=yes print-frames=yes
Configure /usr/local/etc/yate/regexroute.conf:
in [contexts]
.*=default
in [default]
^99$=tone/milliwatt
It will make YATE play tone when you call number 99 from you SIP phone
Configure /usr/local/etc/yate/tdmcard.conf: Make sure you have section [tdm1]:
span=1 type=E1
hdlc_local_addr=192.168.33.49 hdlc_local_port=20000 n64_link_id=1 n64_remote_mac=00:50:C2:81:71:B5 hdlc_remote_addr=192.168.133.93 hdlc_remote_port=10049
192.168.33.49 - IP address of YATE box 00:50:C2:81:71:B5 - Alvis with OtxRtpBridge mac 192.168.133.93 - IP address of Alvis with OtxRtpBridge
Type the name of a command and press enter to execute it, or help for assistance.
Type the name of a command and press enter to execute it, or help for assistance.
