New method JsSIP.NameAddrHeader.parse() which returns a JsSIP.NameAddrHeader instance.
Clean code. Make UA.configuration.uri a JsSIP.URI instance. Also keep ua.configuration.uri port and params as target for UA.call(), UA.sendMessage() and UA.register() (so if ua.configuration.uri is set to 'sip:alice@jssip.net:8080;transport=udp' a REGISTER will have as RURI 'sip:jssip.net:8080;transport=udp').