SNOM phones cannot receive or make calls on my PPPOE internet connection
SNOM IP phones are known for sending very large packets (1500 bytes) that may be dropped by routers that are connected to PPPOE internet connections. PPPOE internet connections have a maximum packet payload of 1492 bytes, which may not be fragmented by the site router and simply dropped.
A solution to this is to use a router that will fragment the packet or attempt to forward it as is. Otherwise, non PPPOE internet access must be used if SNOM phones are to be used onsite.