It depends on your IP phones. We work very well on cisco ip phones with option 
150 in this format: option 150 ip <ip_address>
Working with Asterisk we use the option 160 as follow: option 160 ascii 
"tftp://<ip_address>" for the phones to find the tftp server


Regards
Leonardo
   

----- Mensaje original -----
De: "Manoussos Vichos" <[email protected]>
Para: "Vijaya Laxmi" <[email protected]>
CC: "ccie rs" <[email protected]>
Enviados: Miércoles, 29 de Febrero 2012 13:37:55 GMT -04:30 Caracas
Asunto: Re: [OSL | CCIE_RS] DHCP options

I real world option 150 is used for the phones to find the tftp server

2 012/2/29 Vijaya Laxmi <[email protected]>

> Hello,
>
> Can you tell me what DHCP option does a client use to request TFTP server
> address ?
>
> Also what option is used for ipo phones to grab their ip address and
> config ? is it the same option# as above ?
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_______________________________________________
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-- 





Leonardo A Peña Dávila 
Redes LAN/WAN 
72918 

_______________________________________________
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