Impossible to hear call from UCP

version: 15.0.17.37

Since few days, impossible to hear call receive or done with UCP . The computer or the dialed number ring but no sound.

With Sip phone, no problem. Only with  UCP interface

there are these javascript error in the console, maybe it can help ?

Engine registered
jsphp_563479bdfc0b6ab53fe389c1b46de6c1.js?load_version=v15.0.6.26:31485 Uncaught TypeError: Cannot read property 'presence' of null
at Socket.<anonymous> (jsphp_563479bdfc0b6ab53fe389c1b46de6c1.js?load_version=v15.0.6.26:31485)
at Socket.Emitter.emit (jsphpg_904cc6c59239d6786421b978db118c35.js?load_version=v15.0.6.26:466)
at Socket.onevent (jsphpg_904cc6c59239d6786421b978db118c35.js?load_version=v15.0.6.26:515)
at Socket.onpacket (jsphpg_904cc6c59239d6786421b978db118c35.js?load_version=v15.0.6.26:514)
at Manager.<anonymous> (jsphpg_904cc6c59239d6786421b978db118c35.js?load_version=v15.0.6.26:525)
at Manager.Emitter.emit (jsphpg_904cc6c59239d6786421b978db118c35.js?load_version=v15.0.6.26:466)
at Manager.ondecoded (jsphpg_904cc6c59239d6786421b978db118c35.js?load_version=v15.0.6.26:274)
at Decoder.<anonymous> (jsphpg_904cc6c59239d6786421b978db118c35.js?load_version=v15.0.6.26:525)
at Decoder.Emitter.emit (jsphpg_904cc6c59239d6786421b978db118c35.js?load_version=v15.0.6.26:259)
at Decoder.add (jsphpg_904cc6c59239d6786421b978db118c35.js?load_version=v15.0.6.26:146)
jsphpg_904cc6c59239d6786421b978db118c35.js?load_version=v15.0.6.26:13 JQMIGRATE: jQuery.fn.removeAttr no longer sets boolean properties: disabled
migrateWarn @ jsphpg_904cc6c59239d6786421b978db118c35.js?load_version=v15.0.6.26:13
jsphpg_904cc6c59239d6786421b978db118c35.js?load_version=v15.0.6.26:13 console.trace
migrateWarn @ jsphpg_904cc6c59239d6786421b978db118c35.js?load_version=v15.0.6.26:13
jquery-3.1.1.min.js?load_version=v15.0.6.26:4 [Deprecation] Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.
send @ jquery-3.1.1.min.js?load_version=v15.0.6.26:4
DevTools failed to load source map: Could not load content for https://freepbx.servicevolontaire.org/ucp/assets/js/compiled/main/bootstrap-toggle.min.js.map: HTTP error: status code 403, net::ERR_HTTP_RESPONSE_CODE_FAILURE