Hi,
I received my offer letter on the 23rd of Aug. Thats full 23 days after my ftf interviews and 20 days after the telefonic round.
So, SAP Labs does take an aweful lot of time to release the offer. But yeah, telefonic round means you are definitely in. So just be patient. I know its not easy but no other go. Calling up sandeep or manimoy won't help much. They don't take the calls or give the mundane replies.
However, if you are an experienced candidate and expecting a huge increment you will be disappointed. They offer mediocre packages.
All the best.