Hi, X-Lite has the ability to set some SIP timeout values in a method-dependant manner. This is IMHO not really SIP conform, but it does help when used with some registrar like the one used by the provider sipgate.co.uk In their german FAQ sipgate give this advice for its X-Lite UAC: # Timeout SIP Messages # Timeout Bye SIP Messages # Timeout SIP Provisional Messages are to be set to 2500ms to avoid getting 408 SIP Failure! Is it possible to do the same with pjsip? Cheers Mike