Salve! By using GPRS I was concerned that someone does a DOS against my MS¹and I have to pay for this high prized traffic. But it seems that in Germany 3 of 4 GSM provider use NAT. http://deinadmin.de/article.php/20050804222850304 :)
But this means no server on the Neo1973 without a trick, and no Neo1973 to Neo1973 communication without a server that helps. One Idea would be to use a NSLU2 at home or a vserver, prizes starts at 3 Euro/month (Additional IP 1Euro/month): http://www2.webhostlist.de/host/data/pfc.php4 The vserver will have the handycape that it is not possible to use iptables (and some other NIC near services like ping, traceroute...) I think routing via a virtual network device could help to use a cheap vserver with a firewall. So NAT of the GSM provider would protect us to pay traffic that we don't use and an own server (at home, or vserver) would allow us to be open for other Neo1973 user. Then a hint "multicard/twincard" some GSM provider offers a second (and third) SIM card with the same number for a single payment of 25 Euro: http://www.o2online.de/o2/business/loesungen/grossmittel/produkte/services/multicard/multicard-haupt-art.html With the serial port hack of a NSLU2 it would be possible to use our old GSM mobile at home and use there GPRS 24/24 on. I have no experiances with multicards and if the phones ring simultanious and if SMS are fetchted by only one device or more. With a multi-SIM 2 or more on the Neo1973, a second GSM mobil could forward incomming SMS. Cheaper Roaming for incomming calls *with* Caller ID A *second* Neo1973 at home could forward incomming calls via VoIP to an international prepaid card: http://www.prepaidgsm.net/en/international.html (Free incomming calls in many contries, call fee by VoIP 0.25 Euro/minute) To get the information of the caller number, the multicard could signalisate the incomming caller number and the Neo could switch the 1. SIM of and fetch the call forwarded by Asterisk with an international prepaid card (2. Sim login, call asterisk, asterisk reject, asterisk forwarded call to 2. Sim) You see 2 or better 4 SIM card slots inside the Neo1973 would be comfortable - nice to have :) Many Prepaidcard uses USSD communication to get the prepaid account information, but also to use roaming abroad. http://www.dafu.de/rechts/ussd.html I think that USSD is not a question of the GSM chip, it can be implemented with the extended AT-commands. But with the freedom to program what we like - new, better solutions with USSD would be possible. Because it is possible to ask about the level of the prepaid account for free, an accurate cost information after every call (maybe during a call) is possible to show automaticaly. Greetings, rob ¹ MS mobile station _______________________________________________ OpenMoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
