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190 posts

Master Geek
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Topic # 22719 6-Jun-2008 09:13
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Hi:

I'm an Fusion customer, have been since Feb and am very happy with it, bar some issues with Int'l speeds (but that's another storry..!)

Anyway, I use the SPA2102 as my VoiP ATA, which obviously have the configs locked down.  I belive the configured codec is G729.  I'm wondering if there's any way for us to change and choose which codec to use?  Or do we have to contact xnet and get them to chance it?

Also ntoher question, while in genetal my VFX here is OK, friends and family have commencted thta when talking to us over the phone (via VFX), we sound "very distant", it appears there's some kond of echo.  Not sure why, but I'm getting good connection (approx 7.6 Mbps down, 768k up - I'm still on ADSL1 roadside cabinet), with no traffic on my cnnection at all other that VFX.

The interesting tho, I recently went to Singapore and brought my SPA2102 with my, and plugged straight into a broadband router/connection in SG.  Tried calling someone in Wellington, and it worked fine.  Funny thing is this same friend commented that I sounded much better over the phone that I was at home in Wellington..!  No "distant" sound effect at all!

Anyone has any ideas?






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  Reply # 135879 6-Jun-2008 09:21
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When I had vfx xnet had two codecs, you had to ask for the higher quality codec to be used. One of the reasons I went back to a standard phone line was because of the issues you are having. People ringing us were constantly commenting on the line sounding distant and echoes etc. I was also on the higher quality codec but unfortunately it didn't fix the problem. I was using a PAP2T, maybe the more expensive units could have been better?

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Biddle Corp
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  Reply # 135882 6-Jun-2008 09:22
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The quality of the call and issues such as echo can be affected hugely by the quality of the phone plugged into the ATA - I am assuming this was a different phone in Singapore than what you used in NZ?

IMHO ATA's are fine if you want a cheap entry level VoIP solution but most certainly won't deliver the voice quality that a dedicated IP phone can offer. The problem however is that a cheap IP phone will set you back ~$150ish minimum and if you want 2 or 3 phones in your house or a cordless then you're looking at a rather significant investment!

 
 
 
 




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  Reply # 135926 6-Jun-2008 10:58
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sbiddle: The quality of the call and issues such as echo can be affected hugely by the quality of the phone plugged into the ATA - I am assuming this was a different phone in Singapore than what you used in NZ?



That's a very valid point I think.  I definitely used a different phone in Singapore than the one I used in NZ.  In fact, in Singapore, the phone I used was a corded phone, while in NZ I've only used it with cordless phones.

May try and swap phones around the next time and see if this "fixes" the issues.

But any ideas about changing the codecs?  Can I change it manually or do I have to get Xnet to change it?


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  Reply # 135932 6-Jun-2008 11:06
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wlgspotter:
sbiddle: The quality of the call and issues such as echo can be affected hugely by the quality of the phone plugged into the ATA - I am assuming this was a different phone in Singapore than what you used in NZ?



That's a very valid point I think.  I definitely used a different phone in Singapore than the one I used in NZ.  In fact, in Singapore, the phone I used was a corded phone, while in NZ I've only used it with cordless phones.

May try and swap phones around the next time and see if this "fixes" the issues.

But any ideas about changing the codecs?  Can I change it manually or do I have to get Xnet to change it?



With phones it's normally a case of fiddling with the gain settings to minimise echo as well as try and maximise the volume as it can vary with every phone. These settings along with the codec selection are locked down by WxC but I believe if you ask nicely they will still create custom configurations which are then downloaded to your ATA automatically.





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WorldxChange

  Reply # 135933 6-Jun-2008 11:10
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PM your details,

G729 handles latency and Jitter much better than a G711 codec so is the preferred one for DSl connections, also uses less bandwidth,

The quality of the phone is also a good point, the adapters them selves actually deliver very good quality but can be impacted by the cheap phones, Mics and Earpieces




Yes I am a employee of WxC (My Profile) ... but I do have my own opinions as well Wink

             

https://www.facebook.com/wxccommunications

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WorldxChange

  Reply # 135934 6-Jun-2008 11:12
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sbiddle:
wlgspotter:
sbiddle: The quality of the call and issues such as echo can be affected hugely by the quality of the phone plugged into the ATA - I am assuming this was a different phone in Singapore than what you used in NZ?



That's a very valid point I think.  I definitely used a different phone in Singapore than the one I used in NZ.  In fact, in Singapore, the phone I used was a corded phone, while in NZ I've only used it with cordless phones.

May try and swap phones around the next time and see if this "fixes" the issues.

But any ideas about changing the codecs?  Can I change it manually or do I have to get Xnet to change it?



With phones it's normally a case of fiddling with the gain settings to minimise echo as well as try and maximise the volume as it can vary with every phone. These settings along with the codec selection are locked down by WxC but I believe if you ask nicely they will still create custom configurations which are then downloaded to your ATA automatically.







Gain settings are under user control Steve




Yes I am a employee of WxC (My Profile) ... but I do have my own opinions as well Wink

             

https://www.facebook.com/wxccommunications

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  Reply # 135936 6-Jun-2008 11:15
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maverick: PM your details,

G729 handles latency and Jitter much better than a G711 codec so is the preferred one for DSl connections, also uses less bandwidth,

The quality of the phone is also a good point, the adapters them selves actually deliver very good quality but can be impacted by the cheap phones, Mics and Earpieces


I appreciate what you are saying here about the phone affecting call quality but if the phone provides excellent quality with a standard line and average quality with voip via vfx wouldn't that mean that the adapter itself is affecting the overall quality of the line? This is what I have expierienced anyway, if I could guarantee my call quality would be as good as a standard land line I would consider voip again because I love the extra features it provides.

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  Reply # 135972 6-Jun-2008 13:30
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maverick:


Gain settings are under user control Steve

Do you have some advice on which way to tweak these gain control settings? I.E. if there is echo problems, tweak the x-gain from -3 to ?? etc.

I've played with these a little bit, but was very hard to determine what effects they have; so knowing which direction to tweak would be useful advice.




Chorus has spent $1.4 billion on making their xDSL broadband network faster. If your still stuck on ADSL or VDSL, why not spend from $150 on a master filter install to make sure you are getting the most out of your connection?
I install - Naked DSL, DSL Master Splitters, VoIP, data cabling and general computer support for home and small business.
Rural Broadband RBI installer for Ultimate Broadband and Full Flavour

 

Need help in Auckland, Waikato or BoP? Click my email button, or email me direct: [my user name] at geekzonemail dot com


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  Reply # 135976 6-Jun-2008 13:45
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marmel: I appreciate what you are saying here about the phone affecting call quality but if the phone provides excellent quality with a standard line and average quality with voip via vfx wouldn't that mean that the adapter itself is affecting the overall quality of the line? This is what I have expierienced anyway, if I could guarantee my call quality would be as good as a standard land line I would consider voip again because I love the extra features it provides.


When mixing new and old technology, there are many variables in play. The best solution is end-to-end IP phones; but we are not their yet. So here's a little example of best to not so best (won't say best to worse, as that gives the wrong idea)

IP phone to IP phone = best call quality, lest chance of issues
Phone - ATA to ATA - phone (e.g. two VFX callers using ATA's). Excellent call quality, and with good phones no real issues
Phone - ATA to PSTN - (e.g. VFX call to some one on analogue line). Good call quality, but more prone to issues

Over the next few years as more people move to VoIP, the middle scenario will be much more common, then eventually the top scenario.

I personally notice the best call quality is when on calls to other VFX users. I have the odd customer that when they call with some VFX issue, they comment "bit talking to you is very clear".




Chorus has spent $1.4 billion on making their xDSL broadband network faster. If your still stuck on ADSL or VDSL, why not spend from $150 on a master filter install to make sure you are getting the most out of your connection?
I install - Naked DSL, DSL Master Splitters, VoIP, data cabling and general computer support for home and small business.
Rural Broadband RBI installer for Ultimate Broadband and Full Flavour

 

Need help in Auckland, Waikato or BoP? Click my email button, or email me direct: [my user name] at geekzonemail dot com


313 posts

Ultimate Geek


  Reply # 135997 6-Jun-2008 15:08
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the  codec to use depends on the quality of your DSL connection. The g729 is probably the best considering the variable upload speeds etc experienced through the NZ DSL network. When  DSL2+ is launched soon the 90k guaranteed upload option used with g711 codecs will deliver top quality voice. Meantime if you have 128/FS.....STICK WITH G729. cheers George

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  Reply # 136080 6-Jun-2008 21:12
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marmel: I appreciate what you are saying here about the phone affecting call quality but if the phone provides excellent quality with a standard line and average quality with voip via vfx wouldn't that mean that the adapter itself is affecting the overall quality of the line? This is what I have expierienced anyway, if I could guarantee my call quality would be as good as a standard land line I would consider voip again because I love the extra features it provides.


An ATA designed to have a phone plugged in directly will strictly follow the rules for phone line signals. An exchange designed to have a phone plugged in many km from it will tolerate a lot more incompatibility. So a phone that does not strictly conform to the phone line standard may not work properly in an ATA even though it works properly on an exchange. (Hope you get the idea, it's been along day...).




You can never have enough Volvos!


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  Reply # 136117 7-Jun-2008 00:45
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I found on all my ATA's with analog phones connected that the crappy sound the other person heard back of themselves could largly be sorted by changing the impedance on the config of the analog port.

600 works best on a couple of my phones, one worked better on one of the other options (cant look right now) - basically if you call yourself you cant tell, if you call another phone and go out of the room and talk into the other phone to someone on the analog phone which you changed, its quite apparant when there is the weird echo thing happening.




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