Barton Hodges
2004-Apr-28 10:18 UTC
[Asterisk-Users] Best echo-free and trouble-free system?
We currently have a 15-phone system using Asterisk, a combination of analog phones/Grandstream HandyTone-286 and Grandstream BT101s, and 4 X100Ps connected to analog lines. The system works well except for the occasional echo problem. I have all the echo parameters configured, removed all the extra incoming analog lines except to the PBX, etc. following all the advice on the wiki and on the mailing list. I'm not positive if the echo is due to the analog lines, the X100Ps, or the SIP devices. A customer has expressed their interest in purchasing a system with 10 phones and 4 incoming lines. I do not feel comfortable duplicating the system that we are using. We are willing to put up with a little echo now and then, but the customer should have every right to expect a flawless system without echo, especially if they're replacing an existing proprietary PBX without an echo problem. What is the best setup for ensuring an echo-free and trouble-free system? Digital lines instead of analog? Analog phones connected to TDM400P cards instead of SIP devices? Analog phones connected to a channel bank that is connected to a T100P? Expensive Cisco SIP phones instead of Grandstream HandyTone ATAs?
Raymond McKay
2004-Apr-28 11:12 UTC
[Asterisk-Users] Best echo-free and trouble-free system?
----- Original Message ----- From: "Barton Hodges" <barton@gcmcomputers.com> To: <asterisk-users@lists.digium.com> Sent: Wednesday, April 28, 2004 1:18 PM Subject: [Asterisk-Users] Best echo-free and trouble-free system?> What is the best setup for ensuring an echo-free and trouble-free > system?I regularly build systems for clients based off of Asterisk. If you want to be guaranteed of no echo whatsoever, then going the analog route seems the way to go for now. My small office configurations usually utilize a Dell Optiplex GX270 as the actual phone system server and a T100P connected to an Adtran Channel Bank (TA750) with 1 FXO and 3 FXS Cards. The PowerTouch 390 phones work really well, just make sure you get them though one of the distributors listed on Digium's site unless you have strong familiarity with ADSI programming. You can then run VoIP (I prefer Cisco) phones for offsite phones as necessary. Assuming you need a full 12 phones, the system usually runs about $5000 cost. The Avaya Partner system, a very popular system for small businesses, runs about the same price when you add in all the messaging and call routing modules but of course doesn't support VoIP. Here is a complete list of Parts I use on a standard system Optiplex GX270 ***1 600VA or higher UPS *** VERY IMPORTANT - You don't want bad power to kill the system Digium T100P T1 Interface Adtran TA750 /w 12 FXS - 3 Cards (Part # 4175002L3#AC) Adtran TA750 QUAD FXO Card (Part # 1175407L2) 5' Female to Female Amphenol Cable 24 Port Telephone Patch Panel (2 conductor) - See http://www.phonegeeks.com/patpanwit25p.html 1 24 Port Cat5e Patch Panel Cat5e Cable and RJ45 Jacks (To run between the Desks and Cat5e Patch Panel) Cat3 Cable and RJ11 ends (to patch between the Cat5e panel and the Telephone Panel) Astra PowerTouch 390 Phones (or whatever phone client likes) Some Additional Advice: Always run Cat5e from the desk to the Cat5e patch panel. This way, if echo-cancellation ever becomes flawless in Asterisk, you have a easy migration path to VoIP phones. I generally do create Cat3 jumpers from the Cat5e patch panel to the Telephone Patch panel. For those of you who don't know, RJ11 connectors will fit and work in a RJ45 jack just fine. The same goes for the patch cord from the telephone to the Cat5e phone jack deskside. Mind you, this is not the solution for those looking for the "cheap" way out. If they want a flawless system that rivals and exceeds the reliability of what is in the market today, then they have to be willing to pay for it. I have about 10 systems in production like this at various clients. To date, I have not had any issues with any of them. This configuration is of course my opinion of the best configuration. As the saying goes, your mileage may vary. Raymond McKay President RAYNET Technologies LLC http://www.raynettech.com (860) 833-9720
Ryan Thrash
2004-Apr-28 11:37 UTC
[Asterisk-Users] Best echo-free and trouble-free system?
We too experience echo occasionally, and we're on a PRI, too. We've got echocancel and echotraining set to on. Any pointers here? Thanks, Ryan On Apr 28, 2004, at 12:18 PM, Barton Hodges wrote:> > We currently have a 15-phone system using Asterisk, a combination of > analog phones/Grandstream HandyTone-286 and Grandstream BT101s, and 4 > X100Ps connected to analog lines. The system works well except for > the occasional echo problem. I have all the echo parameters > configured, removed all the extra incoming analog lines except to the > PBX, etc. following all the advice on the wiki and on the mailing > list. I'm not positive if the echo is due to the analog lines, the > X100Ps, or the SIP devices. > > A customer has expressed their interest in purchasing a system with 10 > phones and 4 incoming lines. I do not feel comfortable duplicating > the system that we are using. We are willing to put up with a little > echo now and then, but the customer should have every right to expect > a flawless system without echo, especially if they're replacing an > existing proprietary PBX without an echo problem. > > What is the best setup for ensuring an echo-free and trouble-free > system? > > Digital lines instead of analog? > Analog phones connected to TDM400P cards instead of SIP devices? > Analog phones connected to a channel bank that is connected to a > T100P? > Expensive Cisco SIP phones instead of Grandstream HandyTone ATAs? > > > _______________________________________________ > Asterisk-Users mailing list > Asterisk-Users@lists.digium.com > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
Raymond McKay
2004-Apr-28 11:43 UTC
[Asterisk-Users] Best echo-free and trouble-free system?
----- Original Message ----- From: "Barton Hodges" <barton@gcmcomputers.com> To: <asterisk-users@lists.digium.com> Sent: Wednesday, April 28, 2004 1:18 PM Subject: [Asterisk-Users] Best echo-free and trouble-free system?> What is the best setup for ensuring an echo-free and trouble-free > system?I regularly build systems for clients based off of Asterisk. If you want to be guaranteed of no echo whatsoever, then going the analog route seems the way to go for now. My small office configurations usually utilize a Dell Optiplex GX270 as the actual phone system server and a T100P connected to an Adtran Channel Bank (TA750) with 1 FXO and 3 FXS Cards. The PowerTouch 390 phones work really well, just make sure you get them though one of the distributors listed on Digium's site unless you have strong familiarity with ADSI programming. You can then run VoIP (I prefer Cisco) phones for offsite phones as necessary. Assuming you need a full 12 phones, the system usually runs about $5000 cost. The Avaya Partner system, a very popular system for small businesses, runs about the same price when you add in all the messaging and call routing modules but of course doesn't support VoIP. Here is a complete list of Parts I use on a standard system Optiplex GX270 ***1 600VA or higher UPS *** VERY IMPORTANT - You don't want bad power to kill the system Digium T100P T1 Interface Adtran TA750 /w 12 FXS - 3 Cards (Part # 4175002L3#AC) Adtran TA750 QUAD FXO Card (Part # 1175407L2) 5' Female to Female Amphenol Cable 24 Port Telephone Patch Panel (2 conductor) - See http://www.phonegeeks.com/patpanwit25p.html 1 24 Port Cat5e Patch Panel Cat5e Cable and RJ45 Jacks (To run between the Desks and Cat5e Patch Panel) Cat3 Cable and RJ11 ends (to patch between the Cat5e panel and the Telephone Panel) Astra PowerTouch 390 Phones (or whatever phone client likes) Some Additional Advice: Always run Cat5e from the desk to the Cat5e patch panel. This way, if echo-cancellation ever becomes flawless in Asterisk, you have a easy migration path to VoIP phones. I generally do create Cat3 jumpers from the Cat5e patch panel to the Telephone Patch panel. For those of you who don't know, RJ11 connectors will fit and work in a RJ45 jack just fine. The same goes for the patch cord from the telephone to the Cat5e phone jack deskside. Mind you, this is not the solution for those looking for the "cheap" way out. If they want a flawless system that rivals and exceeds the reliability of what is in the market today, then they have to be willing to pay for it. I have about 10 systems in production like this at various clients. To date, I have not had any issues with any of them. This configuration is of course my opinion of the best configuration. As the saying goes, your mileage may vary. Raymond McKay President RAYNET Technologies LLC http://www.raynettech.com (860) 833-9720
Jeb Campbell
2004-Apr-28 11:48 UTC
[Asterisk-Users] Best echo-free and trouble-free system?
On Apr 28, 2004, at 1:18 PM, Barton Hodges wrote:> What is the best setup for ensuring an echo-free and trouble-free > system?Digital for sure. Even though it only has 4 lines, I would see about getting a partial T1 with PRI. Then you get Direct Inward Dialing, get to set your CallerID, etc. Jeb Campbell jebc@c4solutions.net Cell: 865-385-1437