Hi! 1. question: I wonder if it is possible (using pjsua API) to use TLS as transport, but have the following REGISTER request: REGISTER sip:domain SIP/2.0 That is: - registrar URI without port 5061 and without transport parameter - no Route header 2. question application registered 2 transports: UDP and TLS application registers account1: reg-URL=sip:domain1;transport=tls --> TLS transport will be used application registers account2: reg-URL=sip:domain2;transport=udp --> UDP transport will be used Now, if the application makes an outgoing call to sip:user at domain using account 1 - which transport will be used? TLS (as registration was done via TLS) or UDP (as there is no transport=TLS parameter)? 3. question: I used pjsua application and registered via TLS. In outgoing calls to a SIP URI, the Contact URI is now a SIPS URI - why? I think just because the first hop is secured this does not mean that all hops will be secure. I think the Contact should be a SIPS URI only if the called URI is also a SIPS URI. thanks klaus