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Phones receiving DHCP

We recently had a problem where the phones had a problem receiving a DHCP address from the DC. We set up option 150 and the extra scope and the voice VLAN, but for whatever reason the phones would only get the VLAN ID, but refuse to get an IP address. Some phone get incorrect information, such as bad CM IP information. The only way to configure the phone was to give it a static address, default gateway, and TFTP server, and it would pull the new image down, reload, and register just fine. From there we can set it back to DHCP and the phone will be fine.

Any ideas as to what could have caused this. It happened to each phone (about 80).

Please let me know.

Ohamien

1 ACCEPTED SOLUTION

Accepted Solutions
Bronze

Re: Phones receiving DHCP

I have ran into the same issue many times.

Cisco has a document that somewhat documents the issue:

http://www.cisco.com/en/US/partner/products/sw/voicesw/ps556/products_tech_note09186a008055c1fe.shtml

I always set the voice vlan on the cat switches to be the same as the data vlan with option 150 in the data DCHP scope until all phones were upgraded then set the voice vlan back to what is should be.

3 REPLIES
Bronze

Re: Phones receiving DHCP

I have ran into the same issue many times.

Cisco has a document that somewhat documents the issue:

http://www.cisco.com/en/US/partner/products/sw/voicesw/ps556/products_tech_note09186a008055c1fe.shtml

I always set the voice vlan on the cat switches to be the same as the data vlan with option 150 in the data DCHP scope until all phones were upgraded then set the voice vlan back to what is should be.

New Member

Re: Phones receiving DHCP

Thanks for the information, that will probably do the trick, but referring to the document, our phones never received an error, they just sit around looking for an IP address. Were you getting an error, or no?

Thanks,

Ohamien

Bronze

Re: Phones receiving DHCP

No error showed here either but the document is about the closest thing I can find to the issue I was having.

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