media feature tags feature parameters user agent sip capabilities standards track contact header content negotiation registration

proxy outbound services header field security considerations service-route user agent sip authentication network topology registration

path contact user agent sip security uri proxies standards track network topology registration

privacy mechanisms user agent sip confidentiality security intermediaries standards track authentication privacy identity management

security considerations user agent service location protocol attribute list service agent standards track internationalization directory agent slpv2

server user agent sessions standards security http state management privacy cookies

scalable framework user agent service location protocol service reply service agent authentication service request network services directory agent multicast

user agent sessions standards security protocols http state management set-cookie privacy cookies

email mime user agent standards security multimedia protocols routing quality of service checklist

mail server email communication user agent office protocol tcp post pop3

e-mail user agent mta static routing routing dynamic routing

user agent extensions iana service location protocol service agent sort select directory agent experimental protocol

emergency calls user agent sip video relay service configuration real-time text interoperability authentication media provider selection