Well that is a very good question, and that’s something that you’re going to have to answer for yourself. That said, the choice is yours, try a few out and see what sound you personally (And quite possibly the person who writes your paycheck) are happy with. Personally I aim for higher quality, this is why iLBC stands out well for me. Now, we all want a nice good MOS, because at the end of the day if you’re using a PBX system, there’s nothing worse than it sounding like a VoIPBuster call to some exotic island. The Wikipedia article is a good overview of MOS, each codecs ratings, and some phrases you can use to test the compression yourself and see if words become difficult to understand. MOS stands for “ Mean Opinion Score“, and in a nutshell it’s a way of determining out of 5 how good a particular codec (Read: Phone call) will sound. We’re going to look at a few things very briefly: So do away with expensive BRI interfaces and monthly charges, and go SIP! When you’re a small business, that means with the right kind of QoS, you can share your ADSL Broadband connection and still have 5-10 concurrent phone calls, all happily living together. This is where a compressed codec such as (My personal favorite) iLBC, or g729, can be incredibly cost effective, as you can load up around 15-20 on the same sort of bandwidth. Now that’s a LOT when you think about it, considering on a standard ADSL2+ line you’re going to max out at around 5-7 SIP lines, especially if it’s a shared connection. However, it comes at a price, 64kbps + overheads means around 111kbps when you factor in everything else over an ADSL PPPoA / PPPoE connection. It’s uncompressed and equivalent quality to ISDN, which most businesses are used to with their traditional PABX System. We all know that g711 (alaw / ulaw) is meant to sound the best. Updated Sept 2011 for Elastix-2.* and Asterisk-1.6+ as well as the broken links since Google seems to have taken over GIPS
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