Patent ID: 8503311

Claim:
A method, comprising: recording analog signals exchanged between a telephone device and a Voice-over Internet Protocol (“VoIP”) terminal adapter; capturing packets exchanged between the VoIP terminal adapter and an IP network; determining analog time values corresponding to analog characteristics of the analog signals; determining digital time values corresponding to digital characteristics of the packets, wherein the digital characteristics include a SIP invite; determining a common reference time for the analog time values and digital time values; and determining a processing delay for the VoIP terminal adapter based on the analog time values and the digital time values, wherein the processing delay is a processing time of the VoIP terminal adapter to create a SIP invite packet (D SIP ), wherein determining D SIP is based on: D SIP =( T 3 − T 1 )−( S 3 − S 1 )+ D RTPXMT , wherein, T 1 is a first analog time value of a first analog characteristic corresponding to when a final digit is dialed from the telephone device, T 3 is a second analog time value of a second analog characteristic corresponding to when a speech signal starts, S 1 is a first digital time value of a first digital characteristic corresponding to when the SIP invite packet was sent, S 3 is a second digital time value of a second digital characteristic corresponding to when the speech signal starts and D RTPXMT is a processing time of the VolP terminal adapter to convert an analog signal into a digital signal.