[Freeswitch-users] no audio after hold

Hello I have some problem with sound after hold usage. Sometime the sound disappear after callcenter agent shift unhold.For callcenter agents we use sip.js (version 0.7.2). In freeswitch logs I see strange lines ( https://pastebin.freeswitch.org/24557). Can anyone explain, what happened with audio and how to fix it? -- tarantul Dios es Amor