[asterisk-users] Question about SIP registration

[Aggio Alberto]

Hi guys,
I recently faced an issue regarding SIP registration: I have a 2-NIC Linux PC, with eth0 set to address 192.168.1.1 (NATted over public network, with address 89.X.Y.Z) and eth1 set to address 1.1.1.1. In [sip.conf] I set general option
bindaddr=0.0.0.0                ; IP address to bind to (0.0.0.0 binds to all)
Then I have configured an account as following:

[999]
type=friend
username=999
host=dynamic
port=5080
context=sipfrom
nat=no
canreinvite=no
call-limit=8
videosupport=no
disallow=all
allow=alaw
qualify=15000

So far, so good.
Now, I have an internal process (onto Linux PC) which is a SIP endpoint and should register to Asterisk as 1.1.1.1:5080, but an external entity (i.e. a SIP endpoint over public Internet) is trying to register to Asterisk as 999 at 89.X.Y.Z<mailto:999 at 89.X.Y.Z>:5060 and the registration SUCCEEDS! When I launch the CLI command sip show peers, I see a row like this:

999/999                    1.1.1.1                     5060     OK (3 ms)

Can someone explain me this kind of behaviour? Is it normal? Can I restrict registration of 999 peer only to SIP UA from network 1.1.1.X?

Thanks for your help! Regards,

Alberto Aggio
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