hi All , i had create an transporter for the re-invite msg in a new method "* acquire_call2*" . but when I store the content in the call->med_tp , an error message <Unable to get SDP from media Endpoint : Object is busy (PJ_BUSY) [70011 ] > and the sip re-invite message will not be sent ? How can i change the transport without having this problem ? what is the mean endpoint and the job of this module? my mean object , is to send an re-invite message on my second network interface with different information (such address , contact , different SDP...) i create the transporter with the function <pjsua_transport_create2 > instead of pjsua_transport_create2 to take the address of the second interface Thanks -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20100614/b71dac36/attachment.html>