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VoIP bandwidth and compression?

I have read that the VoIP services offered by some ISPs have a bandwidth of about 24kbps. This is the actual throughput available by the use of the codec G.729.

I want to know of ways to use only use a bandwidth of 8 to 12kbps.

What codecs can I use?  (e.g. G.723.1 ?)

And will I also need to use additional compression techniques?

The header size of each IP frame is also quite large. How can this be controlled or compressed?

I have a feeling that a bandwidth of 10kbps is very narrow and might result in poor voice quality. However, some ISP have found ways of getting around the problem. I would like to have your ideas and knowledge on this.

thanks!

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Hall of Fame Super Gold

Re: VoIP bandwidth and compression?

Already replied in another thread, please do not post duplicates.

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