Hello - Can someone explain me how can I configure a gateway so that it sets/unsets full or part of the SIP message fields specifically RURI, TO, FROM, CONTACT and USER AGENT dynamically for each call 'bridged' to this gateway. Also the SIP OPTIONS ping to use some statically configured values? I can play with the params/variables for leg A (incoming) but unable to do the same for leg B (outgoing). Exporting or static config aren't helping much. One example is if I like to use a SIP domain name e.g. sipdev.example.com in SIP messages e.g. RURI of SIP OPTIONS. But sipdev.example.com cannot be used for DNS lookup. It is common across multiple instances and I would like send the calls to specific instance based on called number. If I set this in Gateway param "proxy", sofia tries to perform DNS lookup before sending out SIP OPTIONS. I am unable to find a way so that sofia takes the IP to send the message to but uses the configured domain to format the SIP messages. Is it possible by configuration or does it need some source modification? Regards, Mohit