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Table 2 VoIP traffic characteristics.

From: Efficient Control Channel Resource Allocation for VoIP in OFDMA-Based Packet Radio Networks

Parameter Value
AMR voice codec rate 12.2 kbps
Voice call length 60 s
Voice activity factor 50%
Mean of active period duration 2 s
Mean of silence period duration 2 s
Voice/SID packet size 40 bytes/15 bytes
Voice/SID packet interarrival time 20 ms/160 ms