[retronet-discuss] GSM module inside Possio Greta fax machines

Hello fellow retronetworkers, Today I received a pair of Possio Greta GSM fax machines from Harald. I haven't powered up either of them yet, as I have no CSD-capable BTS up and running currently (sysmoBTS sadly does not support CSD, and I have yet to tackle the project of trying to bring my ebay-sourced UmTRX to life with osmo-bts-trx), but as I was examining these devices visually, I noted that they are a lot more "modern" than I thought they were. The CE mark on the label sports year 2009, and the IMEI begins with 35368104. The 04 in the FAC field told me right away that it must be a "late GSM era" device, NOT early GSM era, but then I tried looking it up in the IMEIDB leak I once found on Scribd: https://www.freecalypso.org/pub/GSM/IMEI/186248059-Tac.pdf And sure enough, it is right there on page 667: this IMEI belongs to Cinterion MC55i module! So now we know exactly which GSM MS engine these fax machines have inside. :-) And here is the best part: as the IMEIDB entry says and searches for MC55i datasheets confirm, this GSM module and hence the GSM fax machine built around it is quadband! Prior to this discovery, I feared that I would have to not only get a CSD-capable BTS up and running, but also operate it in an EU band for this gear to work - but since it is quadband, I now know that once I do get a CSD-capable BTS, I can run it in whichever band makes the most sense given the spectrum-political situation in my neck of the woods. Needless to say, I look forward to tomorrow's presentation by Harald, where we will hopefully learn how ISDN fax differs from analog and GSM kinds. :-) M~