[Asterisk-Users] WARNING[1125350192]

[Hector Q.-datafull]

Can anybody help me with this error?
I use * only for voip with softphones.
The one I'm trying is X-lite


WARNING[1125350192]: File chan_sip.c, Line 464 (retrans_pkt): Maximum retries exceeded on call
96F16247-B906-4822-9B3C-5845E1096F55 at 192.168.0.1 for seqno 44573 (Response)


my sip.conf is:
[tito]
type=friend
username=tito
secret=.....
host=dynamic
dtmfmode=rfc2833        ; Choices are inband, rfc2833, or info
nat=yes
context=demo
reinvite=no
canreinvite=no

THANKS!
Hector.