Sipp and asterisk

Hi guys,
Iam a newbie to asterisk. I have a query. I wanna test call flow thru asterisk.
I wanna use sipp both as server and client and asterisk as proxy server.

What all I have done is
started asterisk on port 3300
with bind address as 127.0.0.1

added a friend in sip.conf as
[sipp]
type=friend
context=default
host=127.0.0.1
user=sipp
canreinvite=no
disallow=all
allow=ulaw

I started sipp server as [quote]sipp -sn uas[/quote] and sipp client as [quote]sipp -sn uac -s sipp 127.0.0.1:3300[/quote]

I want the messages to be sent to sipp server
I received 484 address incomplete message from asterisk when I verified with wireshark.

Please help me in this.