Re: [Asterisk-Users] Re: Echo SIP-T100P-PRI
On Aug 19, 2004, at 5:33 PM, Rich Adamson wrote: Mike Schwartz wrote: I'm experience echo on outgoing calls: Snom 200 Asterisk T100P PRI called party I am getting echo on the Snom 200 phone. The called party does not hear the echo. snip When that discussion was going on a few weeks ago, the echo issue seemed to have been narrowed down to two possibiliites; 1) interrupt service latency, or, 2) PCI bus latencies. Processor speed does not seem to be a driving factor as noted above. I've not heard anyone (as yet) come up with the tools or process for actually identifying the root-cause. Would be nice for those of us that aren't programmers. Some more echo food for thought. It's most noticeable on very short, hard sounds (like CH), so as someone mentioned, reverb might be the right description. I've spent the better part of several hours experimenting with various combinations of adjusting taps from 32 to 256, echowhenbridged on and off and txgain adjustments. I just flat can't get it to go away... I'm also one of those luck ones with a Supermicro box (dual Xeons and plenty of RAM). How in the heck would/should I go about figuring out what the interrupt service latency or the PCI bus latency is doing. Any other thoughts on the front? I'm using GS phones so maybe their echo can algorithms are to blame... hmmm... Here's to hoping, Ryan Thrash ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Re: Echo SIP-T100P-PRI
Have you considered relocating the hard drive (or Asterisk configs) and the T100P card to a temporary machine? Even a lower class machine, just to eliminate the SuperMicro as the possibility? I'm interested in your research as we will be deploying some low end $800 1U (very short) SuperMicro servers out in the field equipped with T100P cards in them. They have Celeron 2ghz processors, 512mb of RAM and a regular IDE hard drive. But if there is an incompatibility with the way SuperMicro makes their motherboards, then I need to stop them from placing the order for 10 of these units on Monday. Ryan Thrash wrote: On Aug 19, 2004, at 5:33 PM, Rich Adamson wrote: Mike Schwartz wrote: I'm experience echo on outgoing calls: Snom 200 Asterisk T100P PRI called party I am getting echo on the Snom 200 phone. The called party does not hear the echo. snip When that discussion was going on a few weeks ago, the echo issue seemed to have been narrowed down to two possibiliites; 1) interrupt service latency, or, 2) PCI bus latencies. Processor speed does not seem to be a driving factor as noted above. I've not heard anyone (as yet) come up with the tools or process for actually identifying the root-cause. Would be nice for those of us that aren't programmers. Some more echo food for thought. It's most noticeable on very short, hard sounds (like CH), so as someone mentioned, reverb might be the right description. I've spent the better part of several hours experimenting with various combinations of adjusting taps from 32 to 256, echowhenbridged on and off and txgain adjustments. I just flat can't get it to go away... I'm also one of those luck ones with a Supermicro box (dual Xeons and plenty of RAM). How in the heck would/should I go about figuring out what the interrupt service latency or the PCI bus latency is doing. Any other thoughts on the front? I'm using GS phones so maybe their echo can algorithms are to blame... hmmm... Here's to hoping, Ryan Thrash ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users . ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
[Asterisk-Users] Re: Echo SIP-T100P-PRI
I'm experience echo on outgoing calls: Snom 200 Asterisk T100P PRI called party I am getting echo on the Snom 200 phone. The called party does not hear the echo. Rule of thumb (i.e. a good starting point): if you hear the echo it is coming from somewhere else, your equipment mearly makes it noticable. In this case the echo is probably caused by an analog conversion at the remote party. This is quite common but for calls with a very short latency in the call path this is experienced as a reverb and not an echo. Reverb might be a good description. If this is the case--that my CLEC is the source of the echo/reverb when they do a digital to analog conversion, is there anything I can do about it, except try to cancel the echo? Can I ask them to change any settings? They have a 5E switch. My collo is right next door--I just cross connect to get my PRI. The echo I am experiencing is on local calls. My * server is a dual-processor XEON (2.4 Ghz) Supermicro server. Its relatively fast. I will reduce the number of taps, and I was also thinking of decreasing the sample size on the phone from 20ms to 10ms. thanks a lot! - Mike --- Michael Schwartz [EMAIL PROTECTED] President (646)285-6841 Zia Communications http://www.ziacom.us ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Re: Echo SIP-T100P-PRI
Mike Schwartz wrote: I'm experience echo on outgoing calls: Snom 200 Asterisk T100P PRI called party I am getting echo on the Snom 200 phone. The called party does not hear the echo. Rule of thumb (i.e. a good starting point): if you hear the echo it is coming from somewhere else, your equipment mearly makes it noticable. In this case the echo is probably caused by an analog conversion at the remote party. This is quite common but for calls with a very short latency in the call path this is experienced as a reverb and not an echo. Reverb might be a good description. If this is the case--that my CLEC is the source of the echo/reverb when they do a digital to analog conversion, is there anything I can do about it, except try to cancel the echo? Can I ask them to change any settings? They have a 5E switch. My collo is right next door--I just cross connect to get my PRI. The echo I am experiencing is on local calls. My * server is a dual-processor XEON (2.4 Ghz) Supermicro server. Its relatively fast. I will reduce the number of taps, and I was also thinking of decreasing the sample size on the phone from 20ms to 10ms. It seems that echo is not related to processor speed but type of hardware inside. Somebody post, one month ago, to have echo with a Supermicro server then moved to a slower machine, a DL380, and the echo disappear. Jorge thanks a lot! - Mike --- Michael Schwartz [EMAIL PROTECTED] President (646)285-6841 Zia Communications http://www.ziacom.us ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Re: Echo SIP-T100P-PRI
Mike Schwartz wrote: I'm experience echo on outgoing calls: Snom 200 Asterisk T100P PRI called party I am getting echo on the Snom 200 phone. The called party does not hear the echo. Rule of thumb (i.e. a good starting point): if you hear the echo it is coming from somewhere else, your equipment mearly makes it noticable. In this case the echo is probably caused by an analog conversion at the remote party. This is quite common but for calls with a very short latency in the call path this is experienced as a reverb and not an echo. Reverb might be a good description. If this is the case--that my CLEC is the source of the echo/reverb when they do a digital to analog conversion, is there anything I can do about it, except try to cancel the echo? Can I ask them to change any settings? They have a 5E switch. My collo is right next door--I just cross connect to get my PRI. The echo I am experiencing is on local calls. My * server is a dual-processor XEON (2.4 Ghz) Supermicro server. Its relatively fast. I will reduce the number of taps, and I was also thinking of decreasing the sample size on the phone from 20ms to 10ms. It seems that echo is not related to processor speed but type of hardware inside. Somebody post, one month ago, to have echo with a Supermicro server then moved to a slower machine, a DL380, and the echo disappear. When that discussion was going on a few weeks ago, the echo issue seemed to have been narrowed down to two possibiliites; 1) interrupt service latency, or, 2) PCI bus latencies. Processor speed does not seem to be a driving factor as noted above. I've not heard anyone (as yet) come up with the tools or process for actually identifying the root-cause. Would be nice for those of us that aren't programmers. ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
