sounds like an issue with ztdummy, the timing source for outbound audio. tim mckee
On Dec 13, 2006, at 10:27 AM, Bruce Robertson wrote: > We are trying to solve an issue affecting Astlinux installed on a > Soekris 4801-60 (266 MHz, 256MB RAM, booting off a CF card). We used > Astlinux as the basis for an IVR application - it basically plays a > series of sound files for a caller. Most everything works great in the > application, but it is plagued by the sound the caller hears - the > sound > breaks up. It is also playing the sound files, one after another, more > slowly than it should. I’m hoping someone will have advice, since > nothing we try has solved the issues - especially of the audio > breaking up. > > We’re using Astlinux ver 0.3. Running the application on both a voip > connection (a byod provider) and on a POTS line with a handytone 488. > Sound files are G.711 ulaw. The source files (the original wav files) > are good quality (I have a digital recording studio which is used to > create telephony audio all day) On the voip connection, the audio > quality is very poor, and the call breaks up rather badly. On the POTS > connection, using the handytone, the audio quality is much better, and > fewer breakups. But that is only when there is one caller on the > system. > If, for example, we call in on both the POTS line and the voip > connection simultaneously, BOTH calls break up badly, and both seem to > hesitate when going from one sound file to the next. And we have > tested > with only 2 calls at a time. Can’t imagine how bad it would be if > we had > 5 callers on the system at once. > > net4801 works in "Asterisk-Only mode" with eth0 connected to internet. > net4801 uses second ethernet port (eth1) to connect to Handytone-488, > which works like a bridge allowing net4801 to terminate calls from > PSTN > line. We bring up eth1 manually using ifconfig (INTIF is commented out > in rc.conf), so there is no firewall or dhcp server running on eth1. > > Our first thought was that the voip provider is poor, we are losing > packets, the net connection isn’t fast enough - all those things. But > the problem of breaking up also affects the POTS call, which has > nothing > to do with voip. > > It almost seems like the Soekris 4801 isn’t powerful enough to run > this > application (which is really nothing but Astlinux with a bit of > code on > the side). But when we check CPU usage while a call is in progress, it > shows about 95% of CPU processing UNused. It’s seems like the CPU > is not > straining at all to process the call - it just sounds like it is when > you hear it on a phone. > > By the way, these issues occur on two separate Soekris 4801's that are > both running the same application in different locations. > > Can anyone suggest a solution? Thanks! > > Bruce Robertson > _______________________________________________ > Astlinux-users mailing list > [email protected] > http://lists.kriscompanies.com/mailman/listinfo/astlinux-users > > Donations to support AstLinux are graciously accepted via PayPal to > [EMAIL PROTECTED] ============= Timothy McKee VP, Network Services SDN Global +1-704-587-4829 work +1-704-587-4830 NOCC _______________________________________________ Astlinux-users mailing list [email protected] http://lists.kriscompanies.com/mailman/listinfo/astlinux-users Donations to support AstLinux are graciously accepted via PayPal to [EMAIL PROTECTED]
