SIP Trunking vs PRI call quality

Posted on 2007-11-15
Medium Priority
Last Modified: 2013-12-21
We are currently using SIP trunking with our Asterisk box through a small voip company over a high speed cable connection.  Due to some service problems with our current provider we will be switching over to either SIP over a T1 data line, or a service called OneFlex provided by our local phone company which through an integrated appliance provides PRI's over a T1, but lets us use the bandwidth for data when the PRI's are not in use.  As far as I can tell the quality should be the same as a standard PRI.  So my question is this.  With the T1 lines being basically the same and costs basically the same for 10  lines can I expect better call quality using SIP or PRI's with a high quality card w/ hardware echo cancellation?  Thanks in advance for any input.
Question by:evotsi
1 Comment
LVL 36

Accepted Solution

grblades earned 2000 total points
ID: 20292494
A PRI channel should be about the same quality as a G711 SIP channel. They both use the same amount of data bandwidth but PRI is basically uncompressed and therefore works with modems and faxes far better. G711 uses data compression effectivly reducing the resolution of the amplitude by using a logrithmic scale. Its not so good for faxes and modems which rely on this but in theory you get a wider frequency response although it is debatible whether this will be noticeable.

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