Cisco DHCP and Alcatel Ip phone (ip touch 4028)

[ochalmers]

Hi, i'm trying to configure a dhcp pool in the router for some alcatel ip phones but i can't make it work i've already used the option 150 and 66 but without any luck.

Any idea would be appreciated.

Thanks in advance.

Oscar     

[acampbell · Accepted solution]

Oscar,

Option 66 seem correct for these phones.

Try adding the "next-server" option aswell it too should be the TFTP servers address

Something like

!

ip dhcp pool ALCATEL

   network 10.0.101.0 255.255.255.0

   default-router 10.0.101.1

   next-server  10.10.10.10

   option 66 ip 10.10.10.10

!

Regards,
Alex.
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[ochalmers]

Hi Alex,

     Next-server option works fine, do you think it is possible to tell to the phone which vlan it belongs via dhcp?

Thank you so much for your support.

Regards,

Oscar

[acampbell · Accepted solution]

Oscar,

As far as I can see the phone uses option 43 hex 3a:02:HH:HH:ff where HH:HH is the hex value of your voice vlan.

I think you need to configure option 43 on the data vlan.
The phone will then pick up option 43 and then retry for dhcp with the vlan tag (801.Q) on the voice vlan
I would just leave the same parameters/options in both subnets.

Try something like this:-

Lets say Vlan 4 is Data and vlan 104 is voice

HH:HH == 00:68   (104 in HEX)

!
!
ip dhcp pool ALCATEL-DATA-VLAN-4
   network 10.10.4.0 255.255.255.0
   default-router 10.10.4.1
   option 43 hex 3a:02:00:68:ff
   next-server  10.10.10.10
   option 66 ip 10.10.10.10
!
!
!
ip dhcp pool ALCATEL-VOICE-VLAN-104
   network 10.10.104.0 255.255.255.0
   default-router 10.10.104.1
   option 43 hex 3a:02:00:68:ff
   next-server  10.10.10.10
   option 66 ip 10.10.10.10
!

Worth a try.

Hope it helps

Regards,
Alex.
Please rate useful posts.

[ochalmers]

Alex, it works perfectly!!

Thank you so much!!

Oscar