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321 posts

Ultimate Geek

  # 247048 15-Aug-2009 21:00
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Do you know if it uses more bandwith as iLBC or any other?

301 posts

Ultimate Geek
+1 received by user: 36

  # 247056 15-Aug-2009 21:19
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Yes, PCMA (More commonly referred to as "alaw", or "g711") uses 64kbps. When you factor in IP overheads, then if memory serves me correctly you're looking at nearly 110kbps over a PPPoA ADSL Connection.

If you're using iLBC (15.5kbps) it ends up around 44kbps when factoring IP overheads for a single call. Same if you use g729.

IF bandwidth is a premium, switch to g729 or (my favorite) iLBC.

That said, a single VoIP call doesn't use terribly much of your monthly usage unless you're on the phone 24/7, however if you're on a limited-upload connection you'll definitely get better quality out of iLBC :)

Bear in mind that g729 & iLBC *are* compressed, however IMO they still sound pretty darn good. Most un-trained people wouldn't know the difference in sound :D


321 posts

Ultimate Geek

  # 247058 15-Aug-2009 21:29
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Thats a thorough explanation and I'm sure I will look at this a few more times.
I think my BB plan which is 20GB fast up/down should be plenty.
Most likely I will try the iLBC again and check out if there is any noticeable change.
Have a good weekend, what's left of it!

5475 posts

Uber Geek
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  # 247481 17-Aug-2009 09:07
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Good to hear you seem to have got it sorted.
G711 (PCMA/U) consume approx 1.3MB per minute
G729 consume approx .5MB per minute

Chorus has spent $1.4 billion on making their xDSL broadband network faster and even more now as they are upgrading their rural Conklins. If your still stuck on ADSL or VDSL, why not spend $195 on a master filter install to make sure you are getting the most out of your connection?
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321 posts

Ultimate Geek

  # 247484 17-Aug-2009 09:14
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Yeah, it's going very well and I'm glad I moved one of our numbers over.
Things just take time.
Have a good day!

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