NGAP services are divided into two groups:

• Non UE-associated services
• UE-associated services

SCTP (RFC4960) shall be supported as the transport layer of NG-C signaling bearer.

• A single stream shall be reserved for non UE-associated signaling.
• At least one stream shall be reserved for UE-associated signaling.
• All UE-associated signaling for a UE shall use the same stream.