Is the ICM (Internet Communication Component) is needed when using SAP PI ?

Hi guys,
I am aware that the ICM component is needed in SAP PI for various reasons (end-2-end monitoring, GRMG, etc).
However, is that (ICM) component necessary when SAP PI need to exchange with an SAP (ECC) backend ?
Is ABAP proxy need that ICM component ?
Thank !
A+

Quite interesting blog like to share my views and like t get info also
ICM on top of ICF is needed to communicate with Integration Server for determining logical routing and interface mapping and technical routing 
Adapters do communicate with the help of ICM to IS
In Case of HTTP as there is no adapter required, will directly communice to integration Engine pipeline of Integration server
but in case ofHTTPS i think its required for communicating to IS
similarly for IDOC and proxy too applies Somebody can correct me if my understanding is different
Hope it clarifies you to some extent
Rajesh

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