@incollection{Toral-Cruz11,
author = {H. Toral-Cruz and J. Argaez-Xool and L. Estrada-Vargas and D. Torres-Roman},
title = {An Introduction to VoIP: End-to-End Elements and QoS Parameters},
booktitle = {VoIP Technologies},
publisher = {IntechOpen},
address = {Rijeka},
year = {2011},
editor = {Shigeru Kashihara},
chapter = {4},
doi = {10.5772/13520},
url = {https://doi.org/10.5772/13520}
}