[Asterisk-Dev] Peer to Peer Rtp stream

[Comer]

Hello,everyone
To two sip UAs who have registered on Asterisk,If  it is possible(for example,no nat between them ),the RTP stream between them should be peer to peer.
But As I know , If the two sip UAs accouts is store in Database mysql(sipfriends),Not in sip.conf,the RTP stream will be relayed by Asterisk. 
Can anyone tell me why it is? 
Thanks!	

　　　　　　　　Comer
　　　　　　　　hbyang at ustc.edu
　　　　　　　　　　2005-01-06