Hi,
In Case if u need H type connection from ECC system maintain the same in SXMB_ADM IE configuration.
This Type H is estabilish the connection between two local integration engines residing in the respective ABAP stacks of both ECC and PI.
If you want to connect any external system we use RFC type T. for this we have to use gateway service and gateway host of the external system.
Destination Types - Components of SAP Communication Technology - SAP Library
Thanks,
Sreenivas