[asterisk-users] Internet gateway problem

[voip crazy]

Hello all,

I have got an asterisk server in my LAN, getting access to internet trought
a router. I have observed in my asterisk box, when the internet connection
in down, the phones can not register to my asterisk. It is like chan_sip,
does not work without an internet connection.
If when the router is down the telephones does not register, but when I type
in my asterisk box "route del default", teh phones then started to register
against the asterisk.

Why this is happenning?
Why chan_sip, need a gateway or it does not start correctly?
Why when I type "route del default" the phones started to register?

Any clue will be wellcommed

Thanks in advance

VoipCrazy
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