pub.sap.idoc.routing:registerService behaviour?

Guyz,

I am new to SAP Adapter… i have this service [FONT=Arial-BoldMT]pub.sap.idoc.routing:registerService as a startup service for a package in SAP 4.6. I read the documentation and it says that [FONT=TimesNewRomanPSMT][SIZE=3][FONT=TimesNewRomanPSMT][SIZE=3]

This service registers a given service with the routing manager. The best way to use it is to invoke it in a replication or startup service.

[SIZE=2]My question is if we register a srevice using this service then after a restart of the IS do we need to re-register the service again using this service? or we only re-register when we use the [FONT=Arial-BoldMT]
pub.sap.idoc.routing:unregisterService to unregister the same service?

[/font][/size][/SIZE][/FONT][/SIZE][/FONT][/FONT]