Multiple user sessions within one secure channel|OPC UA Standard|Forum|OPC Foundation

Hi,

I've a question regarding secure channel and user session(s) in a secure channel.

We are connecting to an OpcUa server, which allows exactly one secure channel per application certificate. So if I would like to have two user session from a single OpcUa client, the supplier of the OpcUa server suggests that I should create additional user sessions in the secure channel.

As I do not know any OpcUa SDK which allows this (every SDK I know is opening the secure channel and then creating the user session withing this secure channel, but none of them have an API to add a user session to an existing secure channel), I wonder if such a limitation (to allow only one secure channel per application certificate) is within the OpcUa specification?

Thanks!