It is recognized that IP-based networks are increasingly used to deliver voice services to customers.
These networks can impact the end-to-end service quality perceived by users. In order to maintain
network performance required to deliver the desired s
ITU-T E.470-2005 history
2005ITU-T E.470-2005 Operational considerations for QoS of voice over IP-based networks with PSTN-IP-PSTN architecture