问一个MME的问题，如下？

arno

Due to limitations in the current SS7/Object Manager (OBM) implementation, there is still need for certain SS7 legacy configurations even though the SGSN-MME is deployed as a standalone MME. This is recommended to be accomplished by having an M3UA dummy configuration


在MME中已经没有SS7，都是SCTP，但是为什么还要配M3UA的虚拟配置？
是版本不兼容？
还是是原因？