Igor, You need a call leg to perform the eavesdrop. The <channel-uuid> is the channel of an active call that is to be eavesdropped upon. These examples work from the fs_cli command window. You will have to modify the commands with extensions and the correct uuid: Step 1: establish a 2 party call: two party call: originate sofia/internal/5401@10.47.41.109 &bridge(sofia/internal/5901@10.47.41.109) Step 2: invoke eavesdrop with the desired behavior: whisper/coach: originate sofia/internal/5902@10.47.41.109 'queue_dtmf:w2@500,eavesdrop:a28739d0-00f0-4a59-8c82-7a5a74ab6861' inline originate sofia/internal/4901@10.47.32.159 'queue_dtmf:w2@500,eavesdrop:35b70871-78d4-4587-a186-5c0457482515' inline silent monitor: originate sofia/internal/5401@10.47.41.109 'eavesdrop:a28739d0-00f0-4a59-8c82-7a5a74ab6861' inline originate sofia/internal/5002@10.47.32.159 'queue_dtmf:w0@500,eavesdrop:abefa174-12dc-4ccb-956e-67c51475c414' inline From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Igor Olhovskiy Sent: Thursday, July 09, 2015 7:48 AM To: FreeSWITCH Users Help Subject: [Freeswitch-users] Eavesdrop a call. Hi! I'm using Freeswitch 1.4.20 (git b95362f 2015-07-03 16:42:15Z 64bit)) (stable one) and trying to get eavesdropping. But no luck. Main scheme: DID - > extension (210). 210 answers eavesdropping from extension 110. While giving a command eavesdrop <channel-uuid> I've got log full of messages 2015-07-09 13:29:00.325667 [ERR] switch_core_io.c:1531 Write Buffer 0 bytes Failed! and silence on 110 extension While giving a command userspy 210@${domain_name} or userspy <channel-uuid> I've got music-on-hold on 110, no errors on log. In both cases used <channel-uuid> of extension 210 (answered one) Is this a bug or I'm doing something wrong? -- Best regards, Igor ________________________________ NOTE: This e-mail (including any attachments) is for the sole use of the intended recipient(s) and may contain information that is confidential and/or protected by legal privilege. Any unauthorized review, use, copy, disclosure or distribution of this e-mail is strictly prohibited. If you are not the intended recipient, please notify Mitel immediately and destroy all copies of this e-mail. Mitel does not accept any liability for breach of security, error or virus that may result from the transmission of this message.