Hello, I am wondering whether I can add a new parameter (or possibly parameters) to the sip_uri structure because of performance reasons. There are some parameter values that need to be accessed frequently, and having a short-cut to them would be very good, otherwise the linked list for the parameters is always constructed and freed. The current request is for the "rn" parameter from RFC 4694 which may be checked as frequently as ruri.user in certain deployments. If the memory usage is a concern then I can also introduce a #define statement, something like URI_PARAM_SHORTCUTS. Thanks, Miklos