[Asterisk-Users] Problem sip registration

[Javier Rios]

hello

I have a Cisco ATA working with asterisk, but I have east error when it
is tried to validate in asterisk.

Feb  2 10:04:42 NOTICE[1125342512]: File chan_sip.c, Line 5210
(handle_request): Registration from
'<sip:501 at 216.xxx.xxx.72;user=phone>' failed for '200.xxx.xxx.24'
Feb  2 10:04:42 NOTICE[1125342512]: File chan_sip.c, Line 5210
(handle_request): Registration from
'<sip:501 at 216.xxx.xxx.72;user=phone>' failed for '200.xxx.xxx.24'

My sip.config
[501]
type=friend
username=501
secret=cisco
canreinvite=no
host=dynamic
dtmfmode=rfc2833
mailbox=501 
nat=1

Thanks