I've done gain tuning as per the info I've found online. I've got my RXGain set so my volumes list as about 14,800 (using a milliwatt test number and ztmonitor -vv). However listening to the line now, this sounds too loud to me. The person speaking sounds fine, but I've now got a large amount of background hiss coming thru. In order to get the "recommended" levels, most of my lines are in the range of +12.5, so I'm wondering if I'm just exceeding the ability of my Sangoma card to amplify the audio.
My TXGain's are all still at 0.0 as the Sangoma card didn't seem to want to let me adjust the gains. My levels are listing in the 5,000 range, but it seemed no matter what I changed the values to, there was virtually no difference made to the audio levels. Listening to the transmit levels everything sounds fine. What I am still getting is occasional static on the lines. Pops, squeaks, that kind of stuff. Sounds exactly like a handset cord is going bad, but it happens on any phone (and all have brand new handset cords). The person on the far end says they hear nothing wrong with the call. However, when I have asterisk record the call, the static is present on the recording. I also get the occasional robotic voice echoing back on anything said by the local person. That sounds like it should be typical echo on the line (I'm using a Sangoma A400DE with hardware echo cancellation). Everything I can find on echo and static tells me I should adjust my RX and TX gains. So that brings me to my confusion/clarification. I've got my RXGain set to the "recommended" level, and my TXGain doesn't seem to be very adjustable upwards as it would appear to need based on the recommended levels. Could my static and echo be caused by my TXGain being too low, or possibly RX or TX actually being too high (since listening to the RX reveals lots of background hiss)? I'm trying to work out this last little bit on my system as I'm getting grief that these calls have audio issues. I'm running out of things to check, so I'm looking for clarification on where exactly my RX and TX gains should be and which directions they will impact static and echo. Thanks! -chris <www.mythtech.net> _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2009 - October 13 - 15 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
