Hi Bogdan. Thanks for your answer. I was reading about sending a BYE using sipsak or maybe using the SER_FIFO interface. Has anyone succesfully acomplish this? What i'm trying to do is limit the duration of a call. When the call reach the limit, the call is finished by SER. How can i do this? Can someone give me some guidelines? Thanks!! Regards, Ricardo Martinez.- -----Mensaje original----- De: Bogdan Pintea [mailto:pintea@iptego.de] Enviado el: domingo, 12 de noviembre de 2006 11:19 Para: Ricardo Martinez CC: serusers(a)iptel.org Asunto: Re: [Serusers] Limiting call duration. No. All you could do is a stab in the dark by inserting a session timer header at best but result can not be enforced without a B2B application. Ricardo Martinez wrote: -- Bogdan Pintea iptego GmbH - VoIP Security http://www.iptego.de