Adoption Referral Additional Needs Programme
Unlike an AAI LID referral call, this call comes from HHAMA and you will already have been provisionally matched with a child.
The issuing of an Article 17 approval is a matter for HHAMA to propose to the AAI and the AAI to approve. You still get the 'referral call' and although you have a proposal it is still a great day to finally have the approval of all central authorities and to be getting ready to make travel plans.
HHAMA tell us travel is usually 5/6 weeks after acceptance has been returned to China.
So check out the Referral to Travel Handbook for the sections that refer to travel.