More contributed BSD enhancements

apps/app_agi.c

apps/app_disa.c

apps/app_qcall.c

apps/app_voicemail.c

channels/alaw.h

channels/chan_iax.c

channels/chan_iax2.c

channels/chan_mgcp.c

channels/chan_modem.c

channels/chan_modem_aopen.c

channels/chan_modem_bestdata.c

channels/chan_modem_i4l.c

channels/chan_oss.c

channels/chan_sip.c

include/asterisk/channel.h

include/asterisk/lock.h

indications.c

res/res_indications.c

res/res_parking.c