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I have had ongoing problems with the VPMOCT256 modules on these
cards that Digium has not been able to resolve as yet. This has
occurred in multiple sites using a number of different cards, so
it's definitely not a case of just one faulty unit. The VPMOCT256
will intermittently cause dead-silence in one direction of the audio
path.<br>
<br>
My suggestion is the either use 2x quad-port cards (with a timing
cable if need be), or, get the TE820F (i.e. the octal span without
hardware echo cancellation), or, if you do use the TE820BF, disable
the hardware echo cancellation by adding the following to
/etc/modprobe.d/dahdi.conf:<br>
options wct4xxp vpmdtmfsupport=0 vpmsupport=0<br>
<br>
Note that the octal span card itself (TE820F) works absolutely fine
with libss7, even under high volume. I use these both paired (for 16
E1 spans per server) or coupled with TE420's (for 12 E1 spans per
server).<br>
<br>
The only issue is the VPM module.<br>
<br>
<div class="moz-cite-prefix">On 2013/12/12 12:50 PM, Antoine Megalla
wrote:<br>
</div>
<blockquote
cite="mid:1386845450.59859.YahooMailNeo@web121602.mail.ne1.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff; font-family:times
new roman, new york, times, serif;font-size:12pt">
<div>Hi,</div>
<div><br>
</div>
<div style="color: rgb(0, 0, 0); font-size: 16px; font-family:
'times new roman', 'new york', times, serif; background-color:
transparent; font-style: normal;">I have a new SS7
installation where the client wants to connect 8 E1s to the
PSTN switch.</div>
<div style="color: rgb(0, 0, 0); font-size: 16px; font-family:
'times new roman', 'new york', times, serif; background-color:
transparent; font-style: normal;">I was wondering of the
Digium octal span card (<span style="background-color:
rgb(246, 246, 246); color: rgb(65, 65, 65); font-family:
Verdana, Arial, Helvetica, Lucida, sans-serif; font-size:
13px; line-height: 19px;"><span style="font-family: Verdana,
Arial, sans-serif; font-size: 12px; line-height: 18px;">TE820BF</span>) </span><span
style="background-color: transparent;">was tested in
successful SS7 installation and if so was that installation
using libss7 or chan_ss7.</span></div>
<div style="color: rgb(65, 65, 65); font-size: 12px;
font-family: Verdana, Arial, sans-serif; background-color:
transparent; font-style: normal;"><span
style="background-color: transparent;"><br>
</span></div>
<div style="color: rgb(65, 65, 65); font-size: 12px;
font-family: Verdana, Arial, sans-serif; background-color:
transparent; font-style: normal;"><span
style="background-color: transparent;">Thank you for you
help.</span></div>
<div style="color: rgb(65, 65, 65); font-size: 12px;
font-family: Verdana, Arial, sans-serif; background-color:
transparent; font-style: normal;"><span
style="background-color: transparent;"><br>
</span></div>
<div style="color: rgb(65, 65, 65); font-size: 12px;
font-family: Verdana, Arial, sans-serif; background-color:
transparent; font-style: normal;"><span
style="background-color: transparent;">Regards,</span></div>
<div style="color: rgb(65, 65, 65); font-size: 12px;
font-family: Verdana, Arial, sans-serif; background-color:
transparent; font-style: normal;"><span
style="background-color: transparent;">Antoine Megalla</span></div>
</div>
<br>
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<br>
</blockquote>
<br>
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