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Sebastian Stumpf sebastian.stumpf87 at googlemail.comHi, The virtual layer 1 is currently in a state where the l23 app can successfully connect to the bts and most of the signaling messages will be forwarded and handled. TCH is not yet implemented. I have some problems still, not knowing if these are caused by configuration problems or my coding :). - Trying to initiate a call via the mobile vty will result in VTY: call 1 123 OsmocomBB# % (MS 1) % Call has been rejected call 1 123 OsmocomBB# % (MS 1) % Call has been released And no actual call setup message is transfered over the Um interface. What could be reasons for that? I am using the test-sim option the mobile app offers. - Occasionaly the T3210 timer is fired, which causes a new registering within the network. LOG: gsm48_mm.c:336 timer T3210 (loc. upd. timeout) has fired How can i prevent that? - I did not implement a tdma or multiframe scheduler in the mobile uplink as the logical channel is directly put to the gsmtap-header and thus known by the bts. As Harald used a multiframe based scheduling for the bts downlink, i wonder if this might be necessary, though. To submit msgs with the correct frame number for example. - In my wireshark capture files, the gsmtap messages sent over the multicast sockets are only recognized as UDP messages. I have to "cast" them with the wireshark context menu "Decode as...". Why? I would be super happy if someone of you could check out my project (osmo-bts, branch stumpf/virt-phy + osmocom-bb, branch stumpf/virt-phy) try to run it with the config files lying within the project folders and tell me the problems they see :). Here you can find a wireshark capture file of 2 mobiles connecting to a virt bts. I also tried to init calls from both of them but the call setup is not send. https://www.dropbox.com/s/2ccky4ljc8ngahz/mobilex2--ms-virt--bts-virt--bsc-nitb_171002%3Asubscribers-accepted-by-nitb.pcapng?dl=0 Kind Regards, Sebastian Stumpf