Retronetworking

h1. Osmocom icE1usb

h3. Using the icE1usb to provide a S2m line

This configuration will provide an S2m line that behaves like a german Primärmultiplexanschluss/PMX. 

The framing/checksumming configuration required might be different for other countries.

The icE1usb ships in TE mode. You either need to use an E1 cross-over cable or change the jumpers inside the icE1usb.

+Ethernet cross-over cables are different and do not work!+

/etc/dahdi/system.conf:

<pre><code class="shell">

# Span 1: icE1usb/1/0 "Osmocom icE1USB Card 1 Span 0" (MASTER) 

span=1,0,0,ccs,hdb3,crc4

# termtype: nt

bchan=1-15,17-31

dchan=16

# Global data

loadzone        = de

defaultzone     = de

</code></pre>

Apply the config using: 

<pre><code class="shell">

dahdi_cfg -v

</code></pre>

Then create the span assignments using: 

<pre><code class="shell">

dahdi_span_assignments dumpconfig > /etc/dahdi/assigned-spans.conf

</code></pre>

To use Asterisk, create /etc/asterisk/dahdi-channels.conf:

<pre><code class="ini">

; This is not intended to be a complete chan_dahdi.conf. Rather, it is intended

; to be #include-d by /etc/chan_dahdi.conf that will include the global settings

;

; Span 1: icE1usb/1/0 "Osmocom icE1USB Card 1 Span 0" (MASTER) 

group=0,11

context=from-pstn

switchtype = euroisdn

signalling = pri_net

channel => 1-15,17-31

context = default

group = 63

</code></pre>

and /etc/asterisk/chan_dahdi.conf:

<pre><code class="ini">

[trunkgroups]

[channels]

language=de

switchtype=euroisdn

echocancel=no

echocancelwhenbridged=no

transfer=no

pridialplan=unknown

prilocaldialplan=unknown

internationalprefix = 00

nationalprefix = 0

overlapdial=yes

#include dahdi-channels.conf

</code></pre>

(careful: that #include is not a comment)