Patent ID: 7756052

Claim:
A method for managing a voice call over an internet packet network, comprising: obtaining information regarding codec, network delay and packet loss; calculating a parameter representing voice quality of the call based on the obtained information; and rerouting the voice call through the internet packet network if the parameter is below a predetermined value, said parameter being a Mean Opinion Score (MOS), calculated based upon an R-factor, said R-factor being determined as follows: for G.711 R =93.2−0.024 d −40 ln(1+10 PL ) if d =<177.3 (Equation 2a) R =112.7−0.134 d −40 ln(1+10 PL ) if d> 177.3 (Equation 2b) and d=d cdr /2+94 for G.729 R =82.2−0.024 d −44 ln(1+9 PL ) if d =<177.3 (Equation 3a) R =101.7−0.134 d −44 ln(1+9 PL ) if d >177.3 (Equation 3b) and d=d cdr /2+114 for G.723 R =97.7−0.134 d −50 ln(1+8 PL ) (Equation 4) and d=d cdr /2+186 wherein d is a one way delay, d cdr is a delay measured by reading from a gateway computer, and PL is a packet loss.