Hi Daud, On Thu, Sep 06, 2012 at 09:51:37AM +0000, Daud Suleiman wrote: be aware that you sent this to a public mailinglist for openbsc related questions, not to me personally. Thanks on behalf of the development team. sysmoBTS is a single-TRX device. We have a hardware option of stacking multiple sysmoBTS boards to achieve a single BTS with multiple TRX. By default, each TRX has separate TX output / RX input. "multiarfcn" is not an standard language, I believe only OpenBTS uses it. As Peter has pointed out, any BTS with multiple TRX has multiple arfcn. So even the first BTS supported by OpenBSC (BS-11) has two ARFCN. There are a variety of example configuration files in the openbsc source tree, feel free to review them. CSD is not yet implemented, but I hope with Tobias' help we will soon have it working, at least for some BTS models. PoC as present in some phones so far is not a feature of GSM/3GPP specifciations, and it is very hard to get those specifcations. The newer IMS-based method is specified in 3GPP, but I'm not sure which operators have already deployed it. As it is a TCP/IP based service, I think it is fully independent from OpenBSC and just like any other user application out of scope for what we are trying to achieve. But we're of course happy if you want to contribute a PoC server and host it on git.osmocom.org :) Regards, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)