Am Di 8. April 2008 schrieb Tilman Baumann: > Tilman Baumann wrote: > > > Maybe CSD is billed like a voice call. I never used it, but i don't > > remember any special charges for that. > > I dug deeper. Seems like this is true. > > But this raises the question if the Neo can do CSD. Probably it does, > since the GSM module does not appear to be somehow intentionally crippled. > > 9.6 kBit/s is no fun though...
Right, the Neo calypso modem speaks "AT" on the internal serial interface. I don't think there is any problem with the very much Hayes standard AT-commands for CSD. Nearly every phone could do this even 1999. IIRC there even is a 14400B/s mode (at least for networks/areas with support for EFR-codec), and I'm quite sure this isn't charged differently for mobile-originated calls. For Mobile-Terminated calls however, you usually need a second special "data" number linked to your simcard. Otherwise the GSM.network wouldn't know whether or not to set the data-flag for the connection, what means they send the POTS-modem's sound over GSM "as is", instead of recoding it to digital prior to sending it over the air. This might not apply for MT-ISDN-calls, with data-service flag set for the originating device. HTH cheers jOERG _______________________________________________ Openmoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
