Idea: have a separate GSUP manual
In our user manuals, we typically describe how to use a program. But the common/chapters/gsup.adoc rather amounts to a protocol definition.
A similar type of document is the osmobts-abis.pdf that defines the Abis protocol as implemented by osmo-bts.
In the same sense I'd argue that it makes no sense to include the complete GSUP protocol definition in all of the HLR, MSC, SGSN user manuals, and we should have a separate osmo-gsup.pdf instead.