Hi, I am using FS for couple years, it was works OK. And, approx 1 year ago, I tested with FreeSWITCH phone Nortel 1535. It worked perfect. Thereafter, I couple times upgraded FS, and right now, I run version from GIT, dated 11-10-29. OS: FreeBSD 7.2, 32 bits. I again connected Nortel 1535, and this time see, connection suddenly broken during call to any "robot": FS #5000, FS #4000, CallCentric #17771234567 Every time, before disconnect, I see chain of log messages like: [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] and HANGUP thereafter. See following samples from the log: Another phones, like VM1188T or PAP2, still works OK. About Nortel: I tested 3 phones, with two firmwares (2.50 & 2.76) -- problem same on both. Can you suggest me, how to fix this issue? Thanks, Oleg CallCentric: 7771234567 2011-11-02 16:39:20.901219 [DEBUG] sofia_reg.c:1984 Changing expire time to 103 by request of proxy sip:callcentric.com 2011-11-02 16:39:31.108503 [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 16:39:31.108503 [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 16:39:31.108503 [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 16:39:31.108503 [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 16:39:31.130669 [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 16:39:31.130669 [DEBUG] sofia.c:5283 Channel sofia/internal/1000@olegh.ath.cx entering state [terminating][0] 2011-11-02 16:39:31.130669 [DEBUG] switch_channel.c:2804 (sofia/internal/1000@olegh.ath.cx) Callstate Change ACTIVE -> HANGUP 2011-11-02 16:39:31.130669 [NOTICE] sofia.c:6039 Hangup sofia/internal/1000@olegh.ath.cx [CS_EXECUTE] [NORMAL_UNSPECIFIED] 2011-11-02 16:39:31.130669 [DEBUG] switch_channel.c:2820 Send signal sofia/internal/1000@olegh.ath.cx [KILL] 2011-11-02 16:39:31.130669 [DEBUG] switch_core_session.c:1177 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] FS: 5000 2011-11-02 17:03:08.207852 [DEBUG] switch_ivr_play_say.c:1672 done playing file /usr/local/freeswitch/sounds/ru/RU/elena/ivr/ivr-to_do_a_freeswitch_echo_test.wav 2011-11-02 17:03:08.459809 [DEBUG] switch_ivr_play_say.c:244 Handle play-file:[ivr/ivr-please.wav] (ru:ru) 2011-11-02 17:03:08.459809 [DEBUG] switch_ivr_play_say.c:1302 Codec Activated L16@8000hz 1 channels 20ms 2011-11-02 17:03:09.257683 [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 17:03:09.257683 [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 17:03:09.257683 [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 17:03:09.280490 [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 17:03:09.280490 [DEBUG] sofia.c:5283 Channel sofia/internal/1000@olegh.ath.cx entering state [terminating][0] 2011-11-02 17:03:09.280490 [DEBUG] switch_channel.c:2804 (sofia/internal/1000@olegh.ath.cx) Callstate Change ACTIVE -> HANGUP 2011-11-02 17:03:09.280490 [NOTICE] sofia.c:6039 Hangup sofia/internal/1000@olegh.ath.cx [CS_EXECUTE] [NORMAL_UNSPECIFIED] 2011-11-02 17:03:09.280490 [DEBUG] switch_channel.c:2820 Send signal sofia/internal/1000@olegh.ath.cx [KILL] 2011-11-02 17:03:09.280490 [DEBUG] switch_core_session.c:1177 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 17:03:09.280490 [DEBUG] switch_ivr_play_say.c:1672 done playing file /usr/local/freeswitch/sounds/ru/RU/elena/ivr/ivr-please.wav 2011-11-02 17:03:09.532638 [DEBUG] switch_ivr_menu.c:348 waiting for 4/4 digits t/o 2000 2011-11-02 17:03:09.532638 [DEBUG] switch_ivr_menu.c:395 digits '' 2011-11-02 17:03:09.532638 [DEBUG] switch_ivr_menu.c:585 IVR menu 'demo_ivr' no input detected 2011-11-02 17:03:10.587476 [DEBUG] switch_ivr_menu.c:599 exit-sound 'voicemail/vm-goodbye.wav' 2011-11-02 17:03:10.587476 [DEBUG] switch_core_session.c:2269 sofia/internal/1000@olegh.ath.cx skip receive message [APPLICATION_EXEC_COMPLETE] (channel is hungup already) FS: voicemail 2011-11-02 16:51:50.217856 [DEBUG] switch_ivr_play_say.c:67 No language specified - Using [ru] 2011-11-02 16:51:50.307721 [DEBUG] switch_ivr_play_say.c:244 Handle say:[1290554584] (ru:ru) 2011-11-02 16:51:50.307721 [INFO] mod_say_ru.c:721 ru_say!!! 1290554584! say_opt.gender=0 say_opt.cases=0 2011-11-02 16:51:50.307721 [DEBUG] switch_ivr_play_say.c:1302 Codec Activated L16@8000hz 1 channels 20ms 2011-11-02 16:51:50.969016 [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 16:51:50.969016 [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 16:51:50.969016 [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 16:51:50.969016 [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 16:51:50.969016 [DEBUG] switch_core_session.c:872 Send signal sofia/internal/1000@olegh.ath.cx [BREAK] 2011-11-02 16:51:50.990445 [DEBUG] sofia.c:5283 Channel sofia/internal/1000@olegh.ath.cx entering state [terminating][0] 2011-11-02 16:51:50.990445 [DEBUG] switch_channel.c:2804 (sofia/internal/1000@olegh.ath.cx) Callstate Change ACTIVE -> HANGUP 2011-11-02 16:51:50.990445 [NOTICE] sofia.c:6039 Hangup sofia/internal/1000@olegh.ath.cx [CS_EXECUTE] [NORMAL_UNSPECIFIED] 2011-11-02 16:51:50.990445 [DEBUG] switch_channel.c:2820 Send signal sofia/internal/1000@olegh.ath.cx [KILL] 2011-11-02 16:51:50.990445 [DEBUG] switch_core_session.c:1177 Send signal sofia/internal/1000@olegh.ath.cx [BREAK]