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Author Topic: Any Known Issues With Echo On PSTN Calls?  (Read 10097 times)
Thunderbird1
OBi110 Beta Testers
***
Posts: 17


« on: January 30, 2011, 11:51:59 pm »

Hi all,

I recently came across the OBi110 and I like what I see so far and am considering purchasing a unit or two.

I've been an avid user of the SPA units (still using a SPA-3000 with original firmware) but the one aspect of the SPA that took a lot of tweaking was the echo on PSTN calls due to the internal VoIP - PSTN leg being bridged as a SIP call.

My question is:
How is the VoIP - PSTN leg bridged within the OBi110? On a PSTN call or during fail-over is the bridging done using an internal SIP call or is a hard relay utilized?

Cheers,
-TB1
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obiliving
OBi Phone Beta Tester
***
Posts: 28


« Reply #1 on: January 31, 2011, 01:28:59 pm »

It's not using the relay; but it's not a SIP call either.
Audio will still go through device a/d and d/a with low latency.
I have not experienced any echo problem myself; and have not
heard other users mentioning it so far.

I had some experience SPA3000 and I understand
the type of echo problem you are talking about.
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MichiganTelephone
OBi110 Beta Testers
***
Posts: 484


« Reply #2 on: January 31, 2011, 02:48:55 pm »

I'm probably not the best person to comment but I can say that I have noticed echo (and some strange noise artifacts) when using a SPA-3000 connected to the FXS port of a provider-supplied SPA-2000.  In that hookup I had to play with gain levels to get the echo down to an acceptable (barely audible) level.  In testing what is essentially the same type of setup here, I don't notice any of that.  Since there's a world of difference between that and a copper pair from a telephone company, all I will say is that it sounds better to me with that particular hookup, and let it go at that.
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Inactive, no longer posting or responding to messages.  Goodbye and good luck.  Some of my old Obihai-related blog posts have been moved to http://tech.iprock.com - note this in NOT my blog; I have simply given the owner permission to repost some of my old stuff.
Thunderbird1
OBi110 Beta Testers
***
Posts: 17


« Reply #3 on: January 31, 2011, 08:20:07 pm »

Thanks for the feedback guys.

Correct me if I'm wrong, my understanding of obiliving's post is that the bridging is done electonically using a/d & d/a circuitry which basically eliminates any potential for echo between the PSTN & FXS.
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