SR OS supports multiple APN connectivity for the same IMSI. When an additional session setup with a different APN is triggered, the system treats this as a completely new session that goes through APN selection and authentication again. PDN session user plane can be instantiated in the same VRF as previous sessions or in different VRFs. Sessions for the same IMSI can belong to the same ESM subscriber by using the same subscriber-id, but are not required to do so. S11 messages defined with UE granularity in 3GPP TS 29.274 apply to all sessions of the same IMSI.