The objectives of this TSB are to provide end-to-end voice quality guidelines for North American IP
Telephony and to an E-Model tutorial for IP scenarios. IP Telephony introduces several impairments,
some of which are familiar and some new. The E-Model (ITU-T Recommendation G.107) is a tool
that can estimate the end-to-end voice quality, taking the IP Telephony parameters and impairments
into account. This TSB first describes how the E-Model handles IP Telephony impairments and then
it provides general design recommendations for the best possible voice quality performance
irrespective of cost, available technology or customer requirements. These recommendations are
illustrated with specific IP scenarios to provide an E-Model tutorial for analyzing real networks.