<br><br><div><span class="gmail_quote">On 4/4/06, <b class="gmail_sendername">Remco Barende</b> <<a href="mailto:asterisk@barendse.to" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">asterisk@barendse.to
</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I suspect that in your case the fax channels are not natively bridged. I'm<br>not sure whether native bridging will work if you are using 2 cards.</blockquote><div><br><br>Tnx to all who replied to me, I'm posting a reply I received from Digium support for reference to other having the same problem:
<br><br>Officially, fax communications is not supported, because the precision<br>of the timing and jitter is not sufficient for clean enough transmission<br>of the fax signalling to offer 100% reliable performance.<br><br>
That being said, faxing generally works over bridged TDM connections.<br>The problem you are likely having is one or both of the following:<br><br>1. The timing sync of the cards is not going to work as desired: You are<br>
taking timing from the telco (assumably) on one card, and in order for<br>the fax bridge to work properly, you'd have to re-send that timing<br>signal out the other card. The timing coming out of the other card (the<br>pri_net span) is not synced to the other span -- it is being generated
<br>by the internal clock on the card itself. Due to this, the timing sync<br>is not making it from the telco to the other PBX. It is possible to sync<br>spans across cards only with the 2 and 4-span cards using a timing cable
<br>between them. It is also possible to sync timing if you had a single<br>dual-span card servicing both the E1s instead.<br><br>2. Less likely: the bridge across the spans is traversing the PCI bus,<br>and system resource contention might be tainting the signal, introducing
<br>jitter, or possibly dropping frames.<br></div><br><div><br><br> </div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">You might want to check with Digium support to verify
<br>
<br>Let me know the result.<br><br>Cheers!<br>Remco<br><br><br>On Tue, 4 Apr 2006, Alessio Focardi wrote:<br><br>> Hi,<br>><br>> I have an asterisk installation with 2 E1 cards<br>><br>> Software version is
<br>><br>> Asterisk 1.2.6<br>> Libpri 1.2.2<br>> Zaptel 1.2.5<br>><br>> I'm having problem with fax transmission, let me explain better my<br>> setup:<br>><br>><br>> My fist TE110P E1 card is connected to the telco line
<br>> the second TE110P E1 one to an Nexspan PBX<br>><br>> so the server is basically sitting between the line, and the pbx.<br>><br>> every call coming from the line is simply redialed in the pbx<br>> every call from pbx is simply redialed to the line
<br>> no answer is done<br>><br>> All is working great with voice, but faxing often results in error, both<br>> receiving and sending.<br></blockquote></div><br>