For my previous post in the subject:

show lchan clearly indicates that the logical connections were never got disconnected. When the above output as made, there were no activity on the BTS for more than 20 minutes, yet these channels are not released:

OpenBSC# show lchan BTS 0, TRX 0, Timeslot 0, Lchan 0: Type SDCCH Connection: 0, State: RELEASE REQUESTED BS Power: 22 dBm, MS Power: 26 dBm No Subscriber Measurement Report: Flags: DLinval RXL-FULL-ul: -110 dBm, RXL-SUB-ul: -110 dBm RXQ-FULL-ul: 0, RXQ-SUB-ul: 0 BTS 0, TRX 0, Timeslot 0, Lchan 1: Type SDCCH Connection: 0, State: RELEASE REQUESTED BS Power: 22 dBm, MS Power: 26 dBm No Subscriber Measurement Report: Flags: DLinval RXL-FULL-ul: -110 dBm, RXL-SUB-ul: -110 dBm RXQ-FULL-ul: 0, RXQ-SUB-ul: 0 BTS 0, TRX 0, Timeslot 0, Lchan 2: Type SDCCH Connection: 0, State: RELEASE REQUESTED BS Power: 22 dBm, MS Power: 26 dBm No Subscriber Measurement Report: Flags: DLinval RXL-FULL-ul: -110 dBm, RXL-SUB-ul: -110 dBm RXQ-FULL-ul: 0, RXQ-SUB-ul: 0 BTS 0, TRX 0, Timeslot 0, Lchan 3: Type SDCCH Connection: 0, State: RELEASE REQUESTED BS Power: 22 dBm, MS Power: 26 dBm No Subscriber Measurement Report: Flags: L1 MS Power: 26 dBm, Timing Advance: 0 RXL-FULL-dl: -47 dBm, RXL-SUB-dl: -47 dBm RXQ-FULL-dl: 0, RXQ-SUB-dl: 0 RXL-FULL-ul: -47 dBm, RXL-SUB-ul: -47 dBm RXQ-FULL-ul: 0, RXQ-SUB-ul: 0 BTS 0, TRX 0, Timeslot 1, Lchan 0: Type SDCCH Connection: 0, State: RELEASE REQUESTED BS Power: 22 dBm, MS Power: 26 dBm No Subscriber Measurement Report: Flags: DLinval RXL-FULL-ul: -110 dBm, RXL-SUB-ul: -110 dBm RXQ-FULL-ul: 0, RXQ-SUB-ul: 0 OpenBSC#

With this method I can fill the whole signalling capacity of the BTS without any actual call or SMS being sent.

Csaba