[Asterisk-Users] Handling SIP clients behind NAT on a semi-dynamic IP

[Bharath]

Is there an option to specify a stun server in those IP phones?


On 12/19/05, Chris Bagnall <asterisk at minotaur.cc> wrote:
>
> Greetings all,
>
> A couple of clients have recently decided they'd like extensions to their
> office PBXs at their homes, so they've duly been provided with
> preconfigured
> phones which register with the Asterisk server at their offices (public
> IPs)
> quite happily.
>
> Every 3-5 days it seems that these remote extensions lose their
> registration
> and are no longer accessible from the asterisk server. In all cases,
> power-cycling the phone solves the problem immediately by forcing the
> phone
> to re-register with the correct IP. The users in question have ADSL in
> their
> homes with a standard consumer router (Netgear DG834), on a semi-dynamic
> IP
> (it changes every few days, or whenever the connection drops and
> reconnects).
>
> >From that point on, there are lots of entries in the logs as follows:
> chan_sip.c: Got 200 OK on REGISTER that isn't a register
>
> So I guess what's happening is the external IP is changing but the phone
> doesn't know, and it's religiously sending its refresh signals every x
> seconds to the asterisk server.
>
> The remote extensions are all defined with nat=yes in sip.conf
>
> Any way to fix this (short of telling the clients they need a static IP) ?
>
> Thanks in advance.
>
> Regards,
>
> Chris
> --
> C.M. Bagnall, Director, Minotaur I.T. Limited
> This email is made from 100% recycled electrons
>
>
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