APPC or CPI-C Applications

An SNA over TCP/IP access node with a dynamically assigned IP address may always initiate sessions to another SNA over TCP/IP access node or gateway with a static IP address.

The only way an SNA over TCP/IP access node or gateway with a static IP address (node A) can initiate a session to a partner with a dynamic IP address (node B) is:

Node B initiated a session to or through node A first.
The session initiated in Step 1 is still active.