AMF now supports a single SCTP POD (single instance) SCTP multihoming where in the ccpu-sctp stack comes up with list of supported Host IPs. As a part of the association formation the association Id corresponds to the list of IPs, instead of single IP.

The stack also supports multihoming for scenarios such as, one-to-many and many-to-many connections until any of IPs are available on either side of SCTP end points (AMF and gNB). At the same time, traffic over multiple IPs is also possible.

The following figure is a depiction of SCTP Multihoming support:

As per the figure following SCTP associations are formed:

1. Associd – 0 [{IP1,IP2},{IP4,IP5}]

2. Associd – 1 [{IP1,IP2},{IP3}]