Hi, We are using PJSIP 0.8.0 in one of our softphone application which is working fine and uses UDP for SIP messages. Now we want to use TCP transport for SIP messages instead of UDP. For achieving the same, we replaced the input parameters in pjsua_transport_create method to PJSIP_TRANSPORT_TCP instead of PJSIP_TRANSPORT_UDP. All other method calls are same. However, now we are getting following error when PJSIP starts the account registration process. pjsua_acc.c Unable to generate suitable Contact header for registration: Unsupported transport (PJSIP_EUNSUPTRANSPORT) [status=171060] pjsua_acc.c Unable to create registration: Unsupported transport (PJSIP_EUNSUPTRANSPORT) [status=171060] Please suggest what do we need to do extra to make it work? Is it necessary to explicitly bind the transport while creating/adding the sip account. As I understand, an account would be able to send requests using any available transports according to the destination. Regards Girish **************** CAUTION - Disclaimer ***************** This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. Infosys reserves the right to monitor and review the content of all messages sent to or from this e-mail address. Messages sent to or from this e-mail address may be stored on the Infosys e-mail system. ***INFOSYS******** End of Disclaimer ********INFOSYS*** -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080905/40c92dd0/attachment.html