7.11 Fallback to GTPv0

29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 18Stage 3TS

Fallback from GTPv2 to GTPv0 shall not be supported. Therefore, GTPv2 entity should not listen to the well-known GTPv0 port 3386.