You really can't do PTP over the internet, at least not meaningfully. Anyone who needs PTP is going to have their own grandmasters, reference sources, etc - and then a distribution network.
Most telecoms applications use an ePRTC source which tends to be implemented as a GPS/GLONASS/Galileo redundant frequency source, plus a local rubidium source or cesium reference. High-end telecoms applications use a hydrogen maser.
You can't stuff that over an unmanaged network and get the performance you need. Hardware needs to support it hop-to-hop.
Most telecoms applications use an ePRTC source which tends to be implemented as a GPS/GLONASS/Galileo redundant frequency source, plus a local rubidium source or cesium reference. High-end telecoms applications use a hydrogen maser.
You can't stuff that over an unmanaged network and get the performance you need. Hardware needs to support it hop-to-hop.