Call setup

Call setup

ATM Signaling and Traffic Control

Published in P. S. Neelakanta, ATM Telecommunications, 2018

Call admission control refers to a set of actions taken by a network during the call setup phase (or during the call renegotiations phase) to decide whether a VC/VP connection can be accepted (admitted) or not. The general conditions for connection admission are: Call (or connection) admission is facilitated only when sufficient network resources are available to establish the connection end-to-end with the required QOSAdmission of such a connection (that is, the new connection) should not affect the QOS of any existing connections.

Studying the Impact of SIP Message Differentiation on the Quality of VoIP Session Control Procedures

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Journal Information

Published in IETE Technical Review, 2021

Jasmina Baraković Husić, Sabina Baraković, Seudin Kasumović

The proposed algorithm also provides a reduction of SRD and SDD values for an order of magnitude. In case of medium signalling load, the mean SRD equals 26.15 ms (σ = ±1.73 ms) without algorithm’s usage and 3.83 ms (σ = ±0.51 ms) with algorithm usage. This may correspond to SIP call setup time of 46 ms obtained in the similar study of SIP performance metrics for VoIP over Long Term Evolution based mission-critical communications systems [33]. The percentage change in SDD is −85.34%. In the same conditions, the mean SDD equals 140.42 ms (σ = ±78.45 ms) without algorithm's usage and 125.28 ms (σ = ±151.32 ms) with its usage. These values are comparable to results obtained in the simulation study of basic telephony end-to-end SIP performance metrics [34]. The percentage difference in SDD between Scenario 1 and Scenario 2 equals −10.78%.

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ATM Signaling and Traffic Control

Studying the Impact of SIP Message Differentiation on the Quality of VoIP Session Control Procedures