
208 ◾ IP Communications and Services for NGN
views between the mathematical and simulation results, including buffer size, mean
queuing delay, and standard deviation of queuing delay for error probability of a
SIP-T message p
e
= 0.004. e mean queuing delay and standard deviation of queu-
ing delay vary slowly as a function of the queue size at SIP-T messages arrival rates
of less than 450. However, these values increase dramatically when the arrival rate
of SIP-T messages exceeds 450. It is reasonable to suggest that this phenomenon is
due to the SIP-T message arrival rate approaching the processing capability of the
system for heavy traffic ...