[Freeswitch-users] Automagic Phone Provisioning

[David Knell]

I don't think it's trivially possible, unless you can stick the PBX
between the DHCP server and the rest of the network.  The reason is that
DHCP reply packets are not broadcast, but sent back to the MAC address
of the originator, so your Ethernet switch won't even let your PBX see
the replies.

Even if it could see them, add something to them and retransmit, the
client will almost certainly already have seen the original reply and
would be likely just to ignore the later one.

Any reason why you can't just ask them to add that option to their
existing DHCP server?  

And how do you know it's done, and, if you've figured out how to do it,
could you share?

--Dave

> Hello all,
> 	I know this is done and I think I figured out how to do it but I don't
> want to reinvent the wheel so here goes.  I am looking for a program
> that will sit on the PBX.  This program will intercept DHCP reply
> packets destined for phones, inject "option 66" into the packet and
> release it back onto the network.
> 
> Some of you might be wondering why I want a program like this.  Simple.
> Lazy clients.  They don't want to mess with their network infrastructure
> to assist us with automated deployment of SIP devices.  They also don't
> want 50-100 devices connecting to an off site server downloading 20-40MB
> of firmware on a reboot.
> 
> The PBX is not hard coded with an IP address.  It's DHCP.  They were
> willing to allow the PBX on the network and assign it a static DHCP
> address.
> 
> Is what I am looking for not possible?  Does someone have a sensible
> solution that doesn't involve dropping the client (yes someone suggested
> that)?
> 
> Thanks in advance for any help you can give.
> 
> DigiLord
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-- 
David Knell, Director, 3C Limited
T: +44 20 3298 2000
E: dave at 3c.co.uk
W: http://www.3c.co.uk