Jay R. Ashworth wrote: > On Thu, Aug 09, 2007 at 11:39:38AM -0400, Gleim, Jason wrote: >> I have an Asterisk box connected to a Nortel Option 11C via a T1. In the >> Asterisk box we have a Sangoma A101C and in the Nortel we have a TMDI >> card. The Nortel is also hooked to the PSTN via a T1 on a different >> NTAK09 PRI card. I've included the Zapata.conf and zaptel.conf files >> below. >> >> Our issue is that when a call is sent over the tie line between the two >> systems, the audio on the Asterisk side is terrible. There are rapid >> 'clicks' on it similar to when you have a cell phone close to an analog >> phone or a set of computer speakers. The clicks start as soon as the >> audio channel is opened (when I start to get rings) and it only affects >> the Asterisk side of the call. But, it affects both inbound and outbound >> audio on that side. On the Nortel side, the audio they hear is soft and >> distorted. On the Asterisk side, the audio they hear is full of the >> clicking but broken thru when the caller speaks. It's almost like the >> 'silence packets' are being interpreted wrong by Asterisk. If I put the >> Asterisk box on the T1 for the PSTN, it works perfect. >> >> The best part of all this... if we disable the TMDI card in the Nortel >> and then re-enable it, the audio is pristine... until the Nortel runs >> it's nightly maintenance routines. Then the noise is back the next day. >> We can always clear the problem with the disable/re-enable trick but it >> always come back after maintenance. > > My bet is clock-slip due to a fight over who's clocking the line. > > Cheers, > -- jra
He means to set the Nortel to be the master for timing and Asterisk to be the slave. That means change: span=1,0,0,esf,b8zs to: span=1,1,0,esf,b8zs .. and whatever you have to do on the Nortel. Kevin _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users