[asterisk-users] Cianet channel bank with noise and echo
Hello. I'm running some asterisks in a small voip provider in Brazil and we're having some problems with a analogic channel bank. When I make calls using analogic extensions, I have a crystal clear quality, but the receptor have a lot of noise and echo. We tested the situation using SIP, E1 links, GSM links, analogic trunks (FXO ports) and we always have the same symptons My configurations for /etc/asterisk/chan_dahdi.conf and /etc/dahdi/system.conf: http://www.pastebin.org/56678 Versions of software: CentOS 5.4 final Asterisk 1.6.2.0-rc2 Dahdi Linux 2.2.0.2 Dahdi Tool 2.2.0 Kernel 2.6.18-164.6.1.el5 Channel Bank Model: (Sorry, no english datasheet) http://www.cianet.ind.br/pt/channel_bank.php Any help is appreciated, Thanks. ___ -- 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
Re: [asterisk-users] Cianet channel bank with noise and echo
On 24 Nov 2009, at 13:05, jefferson alexandre wrote: I'm running some asterisks in a small voip provider in Brazil and we're having some problems with a analogic channel bank. When I make calls using analogic extensions, I have a crystal clear quality, but the receptor have a lot of noise and echo. Does the channel bank have onboard echo cancellation? ___ -- 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
Re: [asterisk-users] Cianet channel bank with noise and echo
On Tue, Nov 24, 2009 at 11:29 AM, Steve Howes steve-li...@geekinter.netwrote: On 24 Nov 2009, at 13:05, jefferson alexandre wrote: I'm running some asterisks in a small voip provider in Brazil and we're having some problems with a analogic channel bank. When I make calls using analogic extensions, I have a crystal clear quality, but the receptor have a lot of noise and echo. Does the channel bank have onboard echo cancellation? Steve, the hardware don't have echo cancellation. Is a TDMoE hardware, plugged directly in asterisk using a straight cable. In asterisk side, the network card haven't auto negotiation, the speed is adjusted to 100mbps full duplex. All electrical sources and ground are ok. ___ -- 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
Re: [asterisk-users] Cianet channel bank with noise and echo
On 24 Nov 2009, at 13:48, jefferson alexandre wrote: Steve, the hardware don't have echo cancellation. Thats probably it You're relying on Asterisks software echo canceling I have seen mixed results. Have you tried adjusting gains? I'd do the following 1. Turn off echo canceler (makes it more obvious whilst you're trying to remove it) 2. Turn down both gains 3. listening' inside your network (i.e. listening to audio coming to your network from the PSTN), adjust the gain upwards until it sounds suitable 4. 'listening' outside of your network (i.e. listening to audio coming from your network to PSTN) do the same. 5. Test for echo. Adjust the gains down for the sound you hear back (i.e. if you hear person inside your network echoing, adjust the gain in '4'). 6. Try and get it as close to echo free as you can using this method 7. Enable any echo canceling you can find to 'tidy up' the leftover echo, try various ones if you need to. voip-info.org/wiki may help 8. Buy hardware echo cancelers next time ;) S ___ -- 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
Re: [asterisk-users] Cianet channel bank with noise and echo
Ok Steve. I will follow these instructions until i get some results. The next time, I will consider buy a hardware with echo canceller ;) On Tue, Nov 24, 2009 at 12:05 PM, Steve Howes steve-li...@geekinter.netwrote: On 24 Nov 2009, at 13:48, jefferson alexandre wrote: Steve, the hardware don't have echo cancellation. Thats probably it You're relying on Asterisks software echo canceling I have seen mixed results. Have you tried adjusting gains? I'd do the following 1. Turn off echo canceler (makes it more obvious whilst you're trying to remove it) 2. Turn down both gains 3. listening' inside your network (i.e. listening to audio coming to your network from the PSTN), adjust the gain upwards until it sounds suitable 4. 'listening' outside of your network (i.e. listening to audio coming from your network to PSTN) do the same. 5. Test for echo. Adjust the gains down for the sound you hear back (i.e. if you hear person inside your network echoing, adjust the gain in '4'). 6. Try and get it as close to echo free as you can using this method 7. Enable any echo canceling you can find to 'tidy up' the leftover echo, try various ones if you need to. voip-info.org/wiki may help 8. Buy hardware echo cancelers next time ;) S ___ -- 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
