Summary

ITU-T Recommendation Y.1531 defines three performance parameters that may be used in specifying, measuring, and comparing the speed, accuracy, and dependability of call set-up processing in networks that employ the session initiation protocol (SIP), with other protocols, in establishing and terminating media sessions ("calls") between users. The parameters may also be used in call processing performance apportionment or accumulation. This Recommendation does not specify numerical performance values.