Recommendation ITU-T G.8275 specifies common aspects of phase and time profiles defined in [ITU-T G.8275.1] and [ITU-T G.8275.2]. This recommendation includes the precision time protocol (PTP) functions per [IEEE 1588] that are necessary to ensure interoperability for the delivery of accurate phase/time synchronization. This new revision incorporates the following updates: Split the contents of the previous revision of [ITU-T G.8275] into this new revision which addresses the common aspects of PTP profiles, and the recommendation [ITU-T G.8274] which addresses the PTP architecture aspects; Revise the title of this recommendation as “Common aspects of PTP profiles for phase/time synchronization”, and rewrite the summary and scope; Rewrite the summary, scope and clause 6; Move the contents of clauses 7 and 9 of the previous revision of [ITU-T G.8275] into the recommendation [ITU-T G.8274]; Move the contents of Annex A, Appendix I, Appendix II, Appendix V, Appendix VII and Appendix X into the recommendation [ITU-T G.8274], and add a reference to the recommendation [ITU-T G.8274] for these annex and appendixes; Improve some contents of Annex F; Add a new Annex G “Synchronization service availability performance metrics (optional)”; Add a new deployment case about IWF into Appendix III; Add a new Appendix XIV “Calculation of offsetScaledLogVariance for T GM timed by PRTC or ePRTC”; Add a new Appendix XV “Considerations of deploying ePRTC and PRTC in the network”; Add a new Appendix XVI “Considerations on timer reconfiguration”.