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Say, do you have a graphic showing the relative quality of the user experience for telephone calls carried over ISDN on copper and those over VoIP calls ? I believe that calls carried over ISDN are of a higher quality in terms of User experience than those over VoIP.
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Say, do you have a graphic showing the relative quality of the user experience for telephone calls carried over ISDN on copper and those over VoIP calls ? I believe that calls carried over ISDN are of a higher quality in terms of User experience than those over VoIP.

Comparison between VoIP and ISDN

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).