Username in login parameter

[GoogleCodeExporter]

What steps will reproduce the problem?
1. install asterisk and red5
2. configure asterisk
3. the latest red5phone

What is the expected output? What do you see instead?
Login success, I see Reg. Failure = 403

Please provide any additional information below.
this is my sip.conf:
[2000]
type=friend
nat=yes
insecure=port,invite
qualify=yes
username=frenda
secret=1234
host=dynamic
disallow=all
allow=alaw
allow=ulaw
context=telpun

my extensions.conf :
exten => 2000,1,Dial(SIP/frenda)

my login parameter:
#Phone : 2000
Username: frenda
Password: 1234
SIP Realm: asterisk
SIP Proxy : localhost
Red5 Url: rtmp:/sip
it's show "Reg. Failure = 403", but when my login parameter:
#Phone : 2000
Username: frenda
Password: 1234
SIP Realm: asterisk
SIP Proxy : localhost
Red5 Url: rtmp:/sip
it's success, what happen with username parameter?

Original issue reported on code.google.com by frenalfa...@gmail.com on 24 Jun 2011 at 1:39

[GoogleCodeExporter]

i have a some problem with you..how did u resolve this issue? 

Original comment by danzTen...@gmail.com on 25 Jul 2011 at 3:55

[GoogleCodeExporter]

change username when login with the number of your phone. clear username from 
your sip.conf and also change your extensions.conf become exten => 
2000,1,Dial(SIP/2000). It's means username doesn't work.

Original comment by frenalfa...@gmail.com on 25 Jul 2011 at 10:01