Hi Pasquale You can do this quite easily by adding a module of your own. Put it on the proper level in the stack and look at incoming messages. If the message type is OPTIONS, you can choose to process it yourself. http://www.pjsip.org/pjsip/docs/html/group__PJSIP__MOD.htm Search in the pjsip code for an example of what a module looks like, it is used for all SIP messages. /Johan Hi at all, one "simple" question? how can i intercept options message sent by my server ? If is it necessary other info, please don't hesitate to ask me. Thanks in advance. Pasquale ________________________________ 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