SDP extensions for setting up circuit- switched audio and video streams Simo Veikkolainen IETF80 Apr 1 st,

Open issues Handling “-” in offer/answer procedure – Media format may be omitted (endpoints may not be aware of the codecs used on the CS bearer) – Proposal: need to explicitly define endpoint behavior (“-” means “don’t care”?) Discriminator byte in User-User Information Element – UUIE has a discriminator byte which doesn’t fit to the current ABNF definition (ALPHA/DIGIT) of “uuie” correlation mechanism – Proposal: a) fix ABNF accordingly, or b) specify that discriminator byte is not included in “uuie” parameter 2

Next steps Fix the open issues Write Offer/Answer procedures for the whole draft – Currently O/A covers only negotiating the correlations mechanisms Relase an updated version WGLC before June? 3