Cisco IP Phone Not Getting IP Address

Unanswered Question
Sep 30th, 2009

hi exeperts,

we are currently using nortel 1140E ip phones and it's working fine when connecting to our 3750G switch. we are migrating to use the cisco 7941 ip phones and our testing failed. the 3750G switch is correctly configured for voice vlan, ospf routing and connecting to the nortel call server. per tshooting, i can ping our DHCP server and cisco call manager IP addresses from source voice vlan. the cisco ip phone is stuck in getting DHCP ip address. was wondering why it worked for nortel but not for cisco. please enlighten.

I have this problem too.
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xcz504d1114 Wed, 09/30/2009 - 05:22

Check that your DHCP server is sending Option 150, option 150 should contain the TFTP server that has the phones configuration files. Without it the phone will be stuck at registering / obtaining an IP.

HTH,

Craig

johnlloyd_13 Wed, 09/30/2009 - 23:44

thanks craig! you gave me a hint to check on our dhcp server. problem was, there's no dhcp scope was set for the voice vlan. when dhcp scope was created and pushed to update the network, cisco ip phone worked!

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