SIP

Mark Handley (ISI) presented the new SIP draft (draft-ietf-mmusic-sip-03). Changes in this revision include:

• Swapped 4xx and 6xx response codes to better match with HTTP.
• The CONFIRM header field has been removed.
• The CONNECTED and BYE methods have been added to make reliable connection startup easier.
• All addresses have became URLs, which gives lots of flexibility. For example, we can have an address of "phone://1-617-253-6011" to relay to a phone network. Concern was expressed that a Session Description could be done both by Session Description Protocol (SDP) and URL; it was explained that URLs were more appropriate for simple media (like a presentation), and SDPs for more complex ones.