Measure the data rate on one call and divide 512k by it for a rough estimate..
actually i meant how to find out how many i could push down the 512k line - with regards to codec bandwidth and signalling etc...
If you want more accuracy make one call and measure the data rate, then two calls and then 3 calls and you should start to see a trend in the increse in traffic per call..
My tests on one call showed GSM to use about 34Kbps* so you should manage 14 concurrent calls.. As a suggestion look at using the iLBC codec which in my test on one call used 25Kbps* which will give you close to 20 calls in your 512K connection..
Later..
*Averaged and Rounded off
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