asterisk users - Sep 2004 - SER -- Asterisk , RTP Question.

Hello.
	I trying to use SER with Asterisk together.  I have a question
regarding the RTP path.  If i make a call from one of my endpoints
registered in SER Server, and that call in particular is forwarded to
Asterisk and then to a PSTN-GW,  Does the media goes through Asterisk?? is
there a way to avoid this ?? Here es my extension.conf

[TO_PSTN]

exten => _00562.,1,Dial(SIP/${EXTEN}@gw1.ip.address)
exten => _00562.,2,Hangup()

Thanks in advance
Ricardo