Synchronization in telecom networks is critically important and like power, the mobile network cannot function properly without it. With 5G and the centralized RAN (C-RAN) architectures that it enables, the distribution of highly accurate frequency, phase and time becomes even more important and challenging. To this end, industry standards bodies including the 3GPP, ITU-T and the IEEE have defined synchronization requirements for the proper operation of the network and to enable interworking. Delivering high-quality synchronization is a must for 5G networks and goes beyond simply meeting minimum standard requirements. This paper discusses the applications, architectures, and features that impose strict synchronization accuracy requirements on the distribution of clock timing throughout mobile transport networks. It discusses how a hybrid model where enhanced synchronous Ethernet equipment clocks are used to assist IEEE 1588 PTP in generating more accurate timing and enable enhanced telecom boundary clocks. These telecom boundary clocks are required to support time-sensitive applications. It also explains how the Nokia IP Anyhaul solution addresses 5G timing requirements with support of these enhanced telecom boundary clocks having full on-path timing support.