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Aastra IP Phone auto discovery failed

Discussion in 'Tomato Firmware' started by wycf, Nov 15, 2008.

  1. wycf

    wycf Network Guru Member

    We were using a cheap SMC router. When I plug in an Aastra IP phone, it will "send" it's MAC address to the configuration server(also a IP PBX) which connected to the same router. When the IP phone get an IP by DHCP then the phone will automatically download config files from the configuration server. We can do more PBX config using the MAC address collected.(It saved all the MAC in a drop-down list in the manage WEB UI)

    Now we replaced the router with a WRT54GL running Tomato 1.21 then we can not see the MAC address information in the configuration server. The phone will still get the IP and it will download the config files then boot up. BUT we don't see and MAC address info collected on the server. If login tomato and we still see the phone as a DHCP client listed in the Device List.

    BTW, the VPN setting on the phone has been disabled.

    Does any one have any idea what is wrong with this? Please help.

    Thanks.
     
  2. humba

    humba Network Guru Member

    That part you need to explain to us.. what exactly goes on on a layer 2 and layer 3 level? I know different IP phones use TFTP for configuration and get the IP address of the TFTP server from a DHCP option (normally option 66 which is meant for TFTP).. could that be something you did with your old router?

    Note that can turn on detailed syslog logging on the phone and thus you could compare what the phone is doing when connected to the old and the new router.. or just use wireshark which always work.
     
  3. wycf

    wycf Network Guru Member

    I will try to further investigate this.

    TFTP seems working. It can push the config file to the phone.

    What I found out is that the IP phone use CDP (Cisco Discovery Protocol). I'll try to wireshark ik to see what is going on.
     

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