Hi, Looking at the PJSUA-LIB and PJSIP sources it seems that adding a Route header is the preferred way of manually specifying and outbound proxy. Since some SIP proxies may not like having a Route header set on a new transaction, I was wondering if there is any other way to specify this, e.g. on a REGISTER. Looking at the source, the only way I can think of doing this implementing my own resolver, but I really don't want to do that... Also, there is some code removing the first route header in an outgoing packet in case of loose routing, but it's commented out (pjsip_process_route_set in sip_util.c). What is the deal with it? Ruud Klaver AG Projects