Using TCAP/MAP between msc-hlr

Hi, I'm interested in inspecting TCAP/MAP interactions between hlr-msc, but it seems osmo-msc osmo-hlr are using a custom protocol(GSUP). Are there any options to do so?Any suggestion would be appreciated. I saw some references to RestComm https://github.com/RestComm/jss7, moji-mobile https://github.com/moiji-mobile/tcap and signerl https://gitea.osmocom.org/erlang/signerl(seems abandoned), any of these combinations would work with osmo-msc/hlr? A side question: is GSUP the only custom protocol used in osmocom gsm network?all other interactions are based on 3GPP?

Best Regards, amir.