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Tobias Engel t-openbsc at tobias.orgHi Harald, sorry for the late answer (I was on vacation (*)). > However, to put things a bit more into perspective and ensure that this > SMSC can also be used in a real GSM core network later on, I would like > to ask you to consider staying in line with how the > primitives/transacitions look like in a real GSM network. Agreed. We should use the real world protocols and only simplify by omitting the parts we currently don't need. > Now the desing questions are: > * do you agree that we should align with those primitives? Yes. > * If yes,is it really worth coding a custom protocol for them, or should > we rather already use at least the MAP encoding, but ignore the > complex TCAP transaction state machines and SCCP routing? There's > already libosmo-asn1-map which should be able to parse and generate > the 'real world' data structures. The extra effort is probably > limited, and if the messages are then simly sent over a raw TCP (IPA) > connection, there is no SS7 complexity. I am definitely against a custom protocol. Using MAP over raw TCP sounds fine to me. I will try to find some time to sit down with Peter some time next week to discuss this further. Regards, -Tobias (*) ... in a remote location where they did have GSM, but they switched off the BTS during the night to save power ;)