Q: Voice Quality Linksys SPA-3102

(For Dutch: see below)

Hi all,

I bought the Linksys SPA-3102 recently and I'm very satisfied with it. I
only have a few but quite annoying 'problems' with it. This thread
addresses the first one.

When I call somebody using the VoIP provider, the voice quality is very
clear. However, when I'm called by somebody else, the voice quality is
very poor (a lot of noise on the line and the other side seems to be
very far away).

Any suggestions to deal with this?

TIA,
Sinna

---

Hallo iedereen,

I heb onlangs een Linksys SPA-3102 gekocht en ben er zeer tevreden over.
Ik heb er echter een paar maar behoorlijk vervelende problemen mee. Deze
draad behandelt de eerste.

Wanneer ik iemand opbel via VoIP, dan is de spraakkwaliteit zeer helder.
Als ik echter door iemand opgebeld wordt, dan is de kwaliteit zeer zwak
(veel ruis op de lijn en de andere kant lijkt heel ver weg te zitten).

Iemand suggesties hoe ik dat kan oplossen?

Alvast bedankt,
Sinna

 

After serious thinking Sinna wrote :

Is this problem when someone calls your VoIP number or PSTN number?

 

I don't have a VoIP-in number (yet?). It's when I'm called on the PSTN
number.

Sinna

 

Sinna formulated on Thursday :

Right. You don't say where in the world the SPA is connected to a PSTN
line. Is it in the Netherlands?

What's the quality like on inbound PSTN calls? Presumably the same.

How did you set up your device? The forum at Voxilla is worth a look.

This post /may/ be useful (I only had a glance at it, though)
<http://forum.voxilla.com/linksys-si...onal-settings-netherlands-kpn-pstn-14318.html>

Also, have a look at the localization wizard
<http://voxilla.com/tools/device-configuration-wizard/linksys-spa-localization-wizard-802.html>

 

No, it's in Belgium, but I also posted this message on a native Dutch
group so I understand the possible confusion.

I don't get you here I suppose? Do you mean if there's a difference
between the quality with or without the gateway in between?

This looks promising but I can't try it out for the moment. I'll have a
look at it this weekend (hopefully).

Also something to keep in mind for the weekend.

Thanks!

Sinna

 

Sinna laid this down on his screen :

You say that outbound VoIP calls the quality is fine, yet when someone
calls you the quality is not so good. Because you don't have a VoIP in
number, I'm presuming that anyone calling you is ringing your regular
fixed line number.

So, inbound calls come in on your fixed line. Am I right?

I was merely asking here, if you call out on your regular, fixed line,
do you suffer from the same poor quality? gw0 (gateway zero) is your
fixed (PSTN) line, as far as the dial plan & the SPA are concerned.

 

What's the quality like on inbound PSTN calls?

There is actually a *slight* degradation of quality of a PSTN-call with the
SPA-3000 or SPA-3102 inbetween. This is because you actually go through the
SPA's DACs and the ADCs and the necessary filters. When making a PSTN call,
the SPA actually works as an FXO to FXS gateway, it does that digitally, not
analogue. The only way the SPA passes trough the analog line as it is, is
when you power it off. This degradation of quality is not huge, but
noticable. I noticed it... but not enough to start looking for help in a
newsgroup, so maybe another thing goes wrong with Sinna's SPA?

Christian - die effe geen zin had om 't in 2 talen te doen

 

The issue I always had was one of low volume when making or receiving
calls via PSTN. No matter how many gain adjustments I made, as
suggested on here or in various dedicated forums, I was never totally
happy with the levels compared to VOIP to VOIP calls. I guess the
above post answers the reasons why it can never be quite the same.

I don't have the device anymore but never got the settings 'quite
right' despite weeks of playing.


Ed.

 

Oh oh...
I've been playing yesterday evening, without success.
If you present here the 'final' result...

Perhaps I'll have to contact Linksys/Cisco directly.

Sinna

 

Hi all,

I *think* I solved it. Tested today and now I can hear the other side
loud and clear. Sometimes they complain about losing signal but AFAIK
that's caused by the VoIP provider.

What I have done as I'm living in Belgium: I've changed the FXS and FXO
Port Impedance to 270/750||150nF. This seems to solve the voice quality
problem.


--

Hallo iedereen,

Ik *denk* dat ik het probleem opgelost heb. Vandaag getest en nu kan ik
de ander kan luid en duidelijk horen. Soms klagen ze wel van wegvallend
signaal maar voor zover ik weet wordt dat veroorzaakt door de
VoIP-aanbieder.

Wat ik gedaan heb als inwoner van België: Ik heb de FXS en FXO Port
Impedances gewijzigd van 600 naar 270/750||150nF. Dat lijkt het probleem
met de spraakkwaliteit op te lossen.


Sinna

 

SPA-3102 regional setting for Belgium

Is was wondering if someone could provide me with the regional settings for a SP-3102 (or similar) ATA for usage in Belgium.