Hi guys, I'm getting that error from time to time and in those cases any reregistration attempt will fail from them on. Checking sip_reg.c I see that "regc->has_tsx = PJ_TRUE;" is set before checking the result of pjsip_endpt_send_request. Perhaps if there is a problem sending the request (like no internet connectivity) has_tsx is never set back to FALSE and regc stays as busy forever? Regards and thx for your support, G. ________________________________ Este mensaje se dirige exclusivamente a su destinatario. Puede consultar nuestra pol?tica de env?o y recepci?n de correo electr?nico en el enlace situado m?s abajo. This message is intended exclusively for its addressee. We only send and receive email on the basis of the terms set out at: http://www.tid.es/ES/PAGINAS/disclaimer.aspx