[Asterisk-Users] SIP (peer to peer?)

[Wim Venneman]

Hi all, Has anyone have an idea why, if you capture the files on a Asterisk network (ex with Ethereal) you always see the communication between the two sip phones( hard or soft) passing through the asterisk server (on UDP layer) Isn't SIP a protocol that (after that it has established the call) , he connects the two users with each other?   Maybe a stupid question, but I'm not a SIP expert.   Thank you for your help.   Wim