Home » Cisco » 642-437 » How many VoIP G.729 calls can be made simultaneously overa 128-kb/s Frame Relay circuit (Layer 3) if 50 percent of the circuit isdedicated to voice and 50 percent is dedicated to data?
Assuming no cRTP or header compression. How many VoIP G.729 calls can be made simultaneously overa 128-kb/s Frame Relay circuit (Layer 3) if 50 percent of the circuit isdedicated to voice and 50 percent is dedicated to data?
A. 1
B. 2
C. 3
D. 4
E. 5
Correct Answer: B
Explanation/Reference:
Bandwidth Calculation Formulas
These calculations are used:
Total packet size = (L2 header: MP or FRF.12 or Ethernet) + (IP/UDP/RTP header) + (voice payload size)
Codec bit rate = codec sample size / codec sample interval PPS = (codec bit rate) / (voice payload size)
Bandwidth = total packet size * PPS
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