I got a few ideas from that book. Concerning QoS, I discovered that there are headers that explicitely detail the required bandwidth for the requested flows. I understood when the resource reservation is performed and how a S-CSCF can apply a policy to an INVITE and reject such invite according to the requested codecs.
Concerning the location/position information, I discovered that IMS messages convey the cell information. However, these headers are removed as soon as the messages are forwarded to foreign networks.
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