[Asterisk-Users] SIP registration problem

[Marco Supino]

Hi,

I am adding phones to my asterisk setup, until now i worked with some 
softphones, with no problem,

I got some Grandstream BT100 phones, and see something strange in the 
log, the on the phone's screen,

This is from the log :

Found peer '122'
Looking for 122 in default
Transmitting (no NAT):
SIP/2.0 404 Not Found


This happends when the action is SUBSCRIBE ,

Now, this is a SIP client, defined in the sip.conf, as
[122]
context=default
...

and also the exten is in the default context in the extension conf file,

Right after the the peer seems to be registered, and the phone seems to 
work, but from time to time, i see "404" on the phone's display, and 
need to "touch" it to make it change (dial something, or just pick up 
and hangup)

I couldnt find why this is happening, i searched, and found some with 
the same problem, but no solution,

If you have any idea why this is happening, i will be glad to hear it.

Thanks.

Marco.