[asterisk-ss7] No Audio on SS7 calls to Remote PRIs

Kevin P. Fleming kpfleming at digium.com
Tue Oct 5 09:20:53 CDT 2010

On 10/05/2010 09:02 AM, Stephan Ellis wrote:
> Any specific point version of 1.6.0 i should use? Or just 1.6.0?

If the underlying problem is, as your switch technician suggests, lack
of response to a particular SS7 message, then going back to an older
version of Asterisk is not going to help. I know the author of the
previous reply was trying to be helpful, but he posts the identical
response to every thread where people are having issues with Asterisk
and SS7... that does not mean he's actually analyzed the problem and
knows that it will be resolved by using 1.6.0.x (there is no "1.6.0").

Since you've determined that the problem only occurs when your Asterisk
box is placing calls to specific remote destinations through your SS7
switch, have you tried any other SS7 clients off that switch calling the
same destinations? I know you've mentioned that you have an additional
Asterisk box using ISDN PRI to that switch, but since that's a different
protocol it's not really going to help (except to verify that your SS7
switch does have a functional audio path between it and the remote

Most likely the message(s) involved here are related to some sort of
SS7/ISDN (or SS7/PSTN) interworking, and chan_dahdi/libss7 just haven't
taken those into account yet. In order to be able to debug the issue,
you're going to have to post a debug log that shows the SS7 traffic
being sent and received for this failing call, so that people who
understand the protocol can try to figure out what is going wrong.

Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
skype: kpfleming | jabber: kfleming at digium.com
Check us out at www.digium.com & www.asterisk.org

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