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Connect asterisk with ISDN via ISDN modem

Posted on 2012-04-13
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Last Modified: 2014-07-25
Hi,
we have the following configuration:
trixbox 2.8.4 and a moden Draytek 2820s and softs phone ( 3CX Phone)
We want to get the telco line (T0)  by the ISDN modem through a trixbox sip trunk. How to configure both. Thank you in advance
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Question by:openlife
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7 Comments
 
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Expert Comment

by:noci
ID: 37845243
I run native Asterisk (not through tripbox etc.) on a gentoo system.
The kernel is configured with mISDN, lcr is used to sit in between mISDN & Asterisk.
mISDN requires some specific ISDN cards, i am not sure if yours qualify.
mISDN can also access a isdn modem if it uses the mISDN over TCP type of connection.

lcr can be obtained from http://www.mISDN.org, it is the native Exchange solution for ISDN only stuff. It also has a lcr_chan driver for asterisk.

Adding mISDN to the kernel should be easy, if it isn;t enabled yet.
lcr is a complete solution, and through the website you should be able to create your configuration,
and otherwise ask here for support.
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Author Comment

by:openlife
ID: 37846048
Trixbox have already misdn module . I used to run it with isdn modem with usb ( draytek mini vigor 128 ) but this one is broken. And Draytek don't sell this anymore . So i have to find a solution with the rooter who can receie isdn line from telco.
Your option talk about using Misdn module , bur my asterisk ( trixbox ) don't have device anymore ( minivigor usb draytek or pci device  ) to be connected with isdn line.

Maybe i don't understand your answer . i want to use this product ( http://www.draytek.com/user/PdListbyNewCategory.php?action=LoadData&Typeid=395 ) like isdn device converter  and send him to the asterisk via trunk sip .

Is it possible ?
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Expert Comment

by:noci
ID: 37846811
With isdn over IP i mean:

mISDN [v2] has a module called l1oip.ko [ layer 1 over ip ].
Then you have an mISDN accesible device on your linux box, that actually used the ISDN modem in you modem. [ At least it works on linux<->linux and the linux kernel on the fritzbox modem do support this.   [ UDP port 931 ].

I had trouble with mISDN directly on Asterisk because they support mISDN v1.x and my kernels provided mISDN v2.x [ Which has a completely different API, and only supports layer 1in the kernel, and all other stuff in f.e. lcr [ Linux Call Router ].

From the Draytec specpage i cannot see that the modem supports this. Maybe look for a frtizbox.

OTOH, your modem can handle SIP, so you can probably also use the SIP access from asterisk to the ISDN line.
If this also works for FAX i don't know. [ depends on T.38 support ], or maybe the Draytec can receive tha fax for you and mail the pages...
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Author Comment

by:openlife
ID: 37869992
hi, sorry to answer lately, i have some trouble with my motherboard, i had to change it because of Irq troubles. it is a asus p8h67 -V model and ethernet 8169  drivers seems not to work.

About ISDN connection between trixbox an 2820vsn vigor, i find this :

http://draytek-france.fr/index.php/supports/aides-techniques/aides-techniques-generale/139-isdn/452-isdn-fxo-isdn-fxo-on-net-off-net-

i'll test with new hardware, maybe creating a sip account on router wtih ISDN FXO option could be a departure.

i'll check chan_lcr option too. But , if i use ISDN FXO option on sip account.  Will i still need   ISDN modules on asterisk ?
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Accepted Solution

by:
noci earned 310 total points
ID: 37871183
With SIP to the modem and ISDN frm there on you will only need SIP support on Asterisk.
chan_lcr is a mISDN v2 replacement for chan_msidn's mISDN v1 implementation.

I will look into the FXO thing later.
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