Guidelines on Port Allocation for New 3GPP Interfaces
IETF has indicated to 3GPP that future IANA port number assignment requests for protocol only used inside 3GPP networks will be likely rejected except if there is a strong justification for it. The present document provides guidelines for resolving the problem with allocating port numbers for new 3GPP interfaces, as an alternative to IANA assigned port numbers.
Starting from 3GPP Rel-17, any 3GPP working group can rely on these guidelines when defining new interfaces, which require new default port number allocation.