Hi Mark, If the voice payload is 160 bytes; g.729 call; Voice Bandwidth (without Layer 2 Overhead), 24kbps [compress header ip rtp] Voice Bandwidth ( Layer 2 Overhead) 28 kbps, So layer-3 bandwidth if compressed g.729 calls, 24 kbps, if not compress then bandwidth is 28 kbps. Could you please correct me if I am wrong in the above calculation? Mark could you please explain normally we are using 160 or 240 byte payload and also sampling rate 20 ms or 30 ms. Try the Voice Codec Bandwidth Calculator [http://tools.cisco.com/Support/VBC/do/CodecCalc2.do], confused with sampling rate. Thank you, Bala.
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