Draft white papers on supplementary services H.450.4/5/6 uploaded

I have uploaded the draft white papers on supplementary services to the incoming directory of the avc-site. These are - H.450.4 Call Hold - H.450.5 Call Park and Call Pickup - H.450.6 Call Waiting and they can be proposed for determination in the SG-16 meeting in September.

The fourth supplementary service, H.450.7 Message Waiting is also ready for determination, but will be uploaded separately by Dave Walker.

--Markku