bilbobbr
join:2005-11-07
Isle of Man
| VOIP and echo
I have an annoying problem. I use voipcheap.co.uk via a zoom 5800 ata. All calls are pretty much fine these days except one. When my wife is caling her Mothers PSTN number via VOIP there is quite often an echo on the line of our own voice. This is quite strange as all other calls have no echo. Also a normal PTSN call to her number is fine. Any suggestions, I just dont know, as I say all other voip calls are fine. |
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mazilo
From Mazilo
Premium
join:2002-05-30
Lilburn, GA | IIRC, this sounds like the PSTN gateway that handles the termination needs some adjustment to its audio gains. You may have to complain this to your VoSP to let them know.
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Mazi (UK Non-Geo Phone: +44-703-194-2574) |
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gbh2o
join:2000-12-18
Greenville, NC
 ·Future Nine Corpor..
·callwithus
·MyPhoneCompany
·VBUZZER
·Voxee
 ·Embarq
·VOIPo
·STANAPHONE
·Axvoice
·Packet8
| reply to bilbobbr
As I understand it, echo of your own voice generally indicates either an unbalance in an analogue link in the connection [i.e. the copper wiring into your mother-in-laws house], extreme signal latency, or just a poorly made [cheap] telephone instrument [your m-i-l's phone] at the far end of your connection.
You have indicated that it only happens on calls to you m-i-l, so I believe you should check on _her_ phone first. Bet it will cure _your_ problem  A new phone for mom is a good investment for peace with your wife! |
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bilbobbr
join:2005-11-07
Isle of Man
| I just had them answer on all of their various phones and it echoed. Called them on skype and there was none. All other calls to the same local area are fine though I cant understand this it being just the one number, but it does look like the voip provider, I have written to them but I doubt that I will get a response as I haven't in the past. |
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bilbobbr
join:2005-11-07
Isle of Man
1 edit | reply to bilbobbr
I tried using my voips softphone to the same result - echo. This would rule out my ATA. However there is an echo cancellation option, echo cancel tail length(ms) this is currently 16. Should I increase this? Also what are SLAC transmit and recieve gains? |
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gbh2o
join:2000-12-18
Greenville, NC
·Future Nine Corpor..
·callwithus
·MyPhoneCompany
·VBUZZER
·Voxee
·Embarq
·VOIPo
·STANAPHONE
·Axvoice
·Packet8
| The echo you hear is not from your end, but most likely coming from your mother-in-law's analog local loop circuit. It is either electrically unbalanced, or there is a low quality phone connected on that circuit. You are hearing a reflection of your voice from there. It may be that the VoIP company's upstream carrier can compensate at the local PSTN termination point. Or, it may just be a cheaply made phone on the line... it only takes one. Of course, this is just my (?mis)understanding of how it all works. |
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bilbobbr
join:2005-11-07
Isle of Man
| reply to bilbobbr
Calls to her number *used* to be okay, but she is adamant that she hasn't added any extra equiptment of any sort since we started getting an echo on her line when calling via VOIP.
I have had them unplug every phone and extention in the house and only have one phone which is a DECT and pretty new plugged into the master socket, and I called them bu there was still an echo. |
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72276539
Premium
join:2001-01-19
Atlanta, GA
| reply to bilbobbr
Can you open a trouble ticket with the provider that is causing you the problems? Could very well be something in their gateway to this particular termination CO. Is Skype not VOIP and clean? If so it eliminates her POTS line as a problem.
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RIP Dimebag- August 20, 1966 to December 8th, 2004. |
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bilbobbr
join:2005-11-07
Isle of Man
| reply to bilbobbr
I have been messing about with the various gain settings on the ATA but I am going to start a separate thread about this as I need some help. Any way I adjusted something call SLAC tx gain turning it down and this seems to have subdued the problem in that the echo is very faint or not noticible, however the side effect seems to be the Mum in law can't hear us as well. I have to test this more thoroughly however as I am still not sure what the heck deos what. |
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bilbobbr
join:2005-11-07
Isle of Man | reply to bilbobbr
I got a firmware update that unlocked a impedance setting which enabled me to change to uk settings. The echo has now completely gone and I have turned the gains back to their defaults. |
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72276539
Premium
join:2001-01-19
Atlanta, GA | reply to bilbobbr
Glad you fixed the analog local loop. |
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