After a mod_callcenter member hangs up, its channel is still present in the system, and its uuid is unkillable. I believe FS team calls it a "stale channel". The uuid-standby agent won't receive any more calls, until he/she hangs up - what would make uuid-standby a "agent hangup and call again" mode. What I'm trying to do, is nothing fancy. Basically I'm following the mod_callcenter documentation without much tweaking. Here's the test case setup: - Freeswitch with default config, mod_callcenter enabled also with default config Tested with the following versions: 1.4.18+git~20150312T185523Z~4eed221b69~64bit (git 4eed221 2015-03-12 18:55:23Z 64bit) 1.5.15b+git~20150117T062211Z~46cf8a4dce~64bit (git 46cf8a4 2015-01-17 06:22:11Z 64bit) 1.5.15b+git~20150421T235828Z~a4d877c189~64bit (git a4d877c 2015-04-21 23:58:28Z 64bit) - Dialplan mod_callcenter entries: <!-- Member dials *91 toenter queue support@default --> <extension> <condition field="destination_number" expression="^\*91$"> <action application="callcenter" data="support@default"/> </condition> </extension> <!-- Agent dials 4099 to wait for uuid-standby calls --> <extension> <condition field="destination_number" expression="^(4099)$"> <action application="set" data="transfer_after_bridge=4099"/> <!-- Remove this if you just want to get a single call <action application="sleep" data="300"/> <!-- Small delay for safety needs --> <action application="set" data="res=${callcenter_config(agent set uuid ${caller_id_number}@$default '${uuid}')}" /> <action application="set" data="res=${callcenter_config(agent set type ${caller_id_number}@$default 'uuid-standby')}" /> <action application="set" data="res=${callcenter_config(agent set status ${caller_id_number}@$default 'Available (On Demand)')}" /> <action application="set" data="res=${callcenter_config(agent set state ${caller_id_number}@$default 'Waiting')}" /> <action application="set" data="cc_warning_tone=tone_stream://%(200,0,500,600,700)"/> <action application="answer" /> <action application="playback" data="$${hold_music}"/> </condition> </extension> - Start FS and add a test agent: callcenter_config agent add 1002@default uuid-standby - Agent (extension 1002) dials 4099: The agent starts hearing music on hold. show channels uuid,direction,created,created_epoch,name,state,cid_name,cid_num,ip_addr,dest,application,application_data,dialplan,context,read_codec,read_rate,read_bit_rate,write_codec,write_rate,write_bit_rate,secure,hostname,presence_id,presence_data,callstate,callee_name,callee_num,callee_direction,call_uuid,sent_callee_name,sent_callee_num,initial_cid_name,initial_cid_num,initial_ip_addr,initial_dest,initial_dialplan,initial_context a1c9b1a4-7926-4da9-9041-100df3d1bbbb,inbound,2015-04-22 18:01:46,1429736506,sofia/internal/1002@192.168.0.136,CS_EXECUTE,1002,1002,192.168.0.103,4099,playback,local_stream://moh,XML,default,PCMU,8000,64000,PCMU,8000,64000,,hajjar-notebook,1002@192.168.0.136,,ACTIVE,,,,,,,1002,1002,192.168.0.103,4099,XML,default callcenter_config agent list name|system|uuid|type|contact|status|state|max_no_answer|wrap_up_time|reject_delay_time|busy_delay_time|no_answer_delay_time|last_bridge_start|last_bridge_end|last_offered_call|last_status_change|no_answer_count|calls_answered|talk_time|ready_time 1002@default|single_box|a1c9b1a4-7926-4da9-9041-100df3d1bbbb|uuid-standby||Available (On Demand)|Waiting|1|5|0|5|5|1429734669|1429735319|1429734669|1429736506|0|0|0|0 - Member (extension 1000) dials *91: The member gets bridged to the uuid-stand by agent. Great. show channels uuid,direction,created,created_epoch,name,state,cid_name,cid_num,ip_addr,dest,application,application_data,dialplan,context,read_codec,read_rate,read_bit_rate,write_codec,write_rate,write_bit_rate,secure,hostname,presence_id,presence_data,callstate,callee_name,callee_num,callee_direction,call_uuid,sent_callee_name,sent_callee_num,initial_cid_name,initial_cid_num,initial_ip_addr,initial_dest,initial_dialplan,initial_context a1c9b1a4-7926-4da9-9041-100df3d1bbbb,inbound,2015-04-22 18:01:46,1429736506,sofia/internal/1002@192.168.0.136,CS_EXCHANGE_MEDIA,1000,1000,192.168.0.103,4099,uuid_bridge,d298fa41-b855-4027-ba4a-ac112df641d5,XML,default,PCMU,8000,64000,PCMU,8000,64000,,hajjar-notebook,1002@192.168.0.136,,ACTIVE,1002,1002,SEND,d298fa41-b855-4027-ba4a-ac112df641d5,1000,1000,1002,1002,192.168.0.103,4099,XML,default d298fa41-b855-4027-ba4a-ac112df641d5,inbound,2015-04-22 18:04:47,1429736687,sofia/internal/1000@192.168.0.136,CS_SOFT_EXECUTE,1000,1000,192.168.0.120,*94000,uuid_bridge,a1c9b1a4-7926-4da9-9041-100df3d1bbbb,XML,default,PCMU,8000,64000,PCMU,8000,64000,,hajjar-notebook,1000@192.168.0.136,,ACTIVE,1002,1002,SEND,d298fa41-b855-4027-ba4a-ac112df641d5,1002,1002,1000,1000,192.168.0.120,*94000,XML,default 2 total. show calls uuid,direction,created,created_epoch,name,state,cid_name,cid_num,ip_addr,dest,presence_id,presence_data,callstate,callee_name,callee_num,callee_direction,call_uuid,hostname,sent_callee_name,sent_callee_num,b_uuid,b_direction,b_created,b_created_epoch,b_name,b_state,b_cid_name,b_cid_num,b_ip_addr,b_dest,b_presence_id,b_presence_data,b_callstate,b_callee_name,b_callee_num,b_callee_direction,b_sent_callee_name,b_sent_callee_num,call_created_epoch d298fa41-b855-4027-ba4a-ac112df641d5,inbound,2015-04-22 18:04:47,1429736687,sofia/internal/1000@192.168.0.136,CS_SOFT_EXECUTE,1000,1000,192.168.0.120,*94000,1000@192.168.0.136,,ACTIVE,1002,1002,SEND,d298fa41-b855-4027-ba4a-ac112df641d5,hajjar-notebook,1002,1002,a1c9b1a4-7926-4da9-9041-100df3d1bbbb,inbound,2015-04-22 18:01:46,1429736506,sofia/internal/1002@192.168.0.136,CS_EXCHANGE_MEDIA,1000,1000,192.168.0.103,4099,1002@192.168.0.136,,ACTIVE,1002,1002,SEND,1000,1000,1429736687 1 total. callcenter_config agent list name|system|uuid|type|contact|status|state|max_no_answer|wrap_up_time|reject_delay_time|busy_delay_time|no_answer_delay_time|last_bridge_start|last_bridge_end|last_offered_call|last_status_change|no_answer_count|calls_answered|talk_time|ready_time 1002@default|single_box|a1c9b1a4-7926-4da9-9041-100df3d1bbbb|uuid-standby||Available (On Demand)|In a queue call|1|5|0|5|5|1429736687|1429735319|1429736687|1429736506|0|1|0|0 - Member hangs up show channels uuid,direction,created,created_epoch,name,state,cid_name,cid_num,ip_addr,dest,application,application_data,dialplan,context,read_codec,read_rate,read_bit_rate,write_codec,write_rate,write_bit_rate,secure,hostname,presence_id,presence_data,callstate,callee_name,callee_num,callee_direction,call_uuid,sent_callee_name,sent_callee_num,initial_cid_name,initial_cid_num,initial_ip_addr,initial_dest,initial_dialplan,initial_context a1c9b1a4-7926-4da9-9041-100df3d1bbbb,inbound,2015-04-22 18:01:46,1429736506,sofia/internal/1002@192.168.0.136,CS_EXECUTE,1002,1002,192.168.0.103,4099,playback,local_stream://moh,XML,default,PCMU,8000,64000,PCMU,8000,64000,,hajjar-notebook,1002@192.168.0.136,,ACTIVE,1000,1000,RECV,d298fa41-b855-4027-ba4a-ac112df641d5,,,1002,1002,192.168.0.103,4099,XML,default d298fa41-b855-4027-ba4a-ac112df641d5,inbound,2015-04-22 18:04:47,1429736687,sofia/internal/1000@192.168.0.136,CS_SOFT_EXECUTE,1000,1000,192.168.0.120,*94000,uuid_bridge,a1c9b1a4-7926-4da9-9041-100df3d1bbbb,XML,default,PCMU,8000,64000,PCMU,8000,64000,,hajjar-notebook,1000@192.168.0.136,,ACTIVE,1002,1002,SEND,d298fa41-b855-4027-ba4a-ac112df641d5,1002,1002,1000,1000,192.168.0.120,*94000,XML,default 2 total. show calls uuid,direction,created,created_epoch,name,state,cid_name,cid_num,ip_addr,dest,presence_id,presence_data,callstate,callee_name,callee_num,callee_direction,call_uuid,hostname,sent_callee_name,sent_callee_num,b_uuid,b_direction,b_created,b_created_epoch,b_name,b_state,b_cid_name,b_cid_num,b_ip_addr,b_dest,b_presence_id,b_presence_data,b_callstate,b_callee_name,b_callee_num,b_callee_direction,b_sent_callee_name,b_sent_callee_num,call_created_epoch d298fa41-b855-4027-ba4a-ac112df641d5,inbound,2015-04-22 18:04:47,1429736687,sofia/internal/1000@192.168.0.136,CS_SOFT_EXECUTE,1000,1000,192.168.0.120,*94000,1000@192.168.0.136,,ACTIVE,1002,1002,SEND,d298fa41-b855-4027-ba4a-ac112df641d5,hajjar-notebook,1002,1002,a1c9b1a4-7926-4da9-9041-100df3d1bbbb,inbound,2015-04-22 18:01:46,1429736506,sofia/internal/1002@192.168.0.136,CS_EXECUTE,1002,1002,192.168.0.103,4099,1002@192.168.0.136,,ACTIVE,1000,1000,RECV,,,1429736687 1 total. callcenter_config agent list name|system|uuid|type|contact|status|state|max_no_answer|wrap_up_time|reject_delay_time|busy_delay_time|no_answer_delay_time|last_bridge_start|last_bridge_end|last_offered_call|last_status_change|no_answer_count|calls_answered|talk_time|ready_time 1002@default|single_box|a1c9b1a4-7926-4da9-9041-100df3d1bbbb|uuid-standby||Available (On Demand)|Waiting|1|5|0|5|5|1429736687|1429735319|1429736687|1429736990|0|1|0|0 Here the agent gets transfered back to uuid-standby extension and restarts hearing moh. It's state is "Waiting" - but he/she won't answer new calls. But the state is "Waiting" only because it got overridden by the dialplan. In my tests, removing the callcenter_config(agent set state..) from dialplan (and controlling agent state via CLI), I've noticed that the agent state never gets back to "Idle" (if On Demand) or "Waiting". It gets stuck in "In a queue call". Trying touuid_kill the member uuid, results in -ERR No such channel! - When agent finally hangs up: 2015-04-22 18:21:56.804183 [NOTICE] sofia.c:952 Hangup sofia/internal/1002@192.168.0.136 [CS_EXECUTE] [NORMAL_CLEARING] 2015-04-22 18:21:56.824219 [NOTICE] switch_core_session.c:1641 Session 6 (sofia/internal/1000@192.168.0.136) Ended 2015-04-22 18:21:56.824219 [NOTICE] switch_core_session.c:1645 Close Channel sofia/internal/1000@192.168.0.136 [CS_DESTROY] 2015-04-22 18:21:57.104198 [NOTICE] switch_core_session.c:1641 Session 4 (sofia/internal/1002@192.168.0.136) Ended 2015-04-22 18:21:57.104198 [NOTICE] switch_core_session.c:1645 Close Channel sofia/internal/1002@192.168.0.136 [CS_DESTROY] show channels, show calls return 0 If callcenter_config(agent set state...) is commented out in dialplan, callcenter_config agent list shows the agent as "Idle". Meaning mod_callcenter only perceives the call has been disconnected, after the agent hangs up... I'm not blaming mod_callcenter - maybe it's related to transfer_after_bridge. I already tried using exec_after_bridge_app/arg to a script that sleeps and transfer back to 4099. I also tried increasing the dialplan sleep. I'd appreciate any advice on how to make uuid-standby work. Thanks in advance, Saumar