ALL IP phones not working

sha111 · June 16th, 2008, 05:04 AM

We have remote site connected to hubsite(s8720,CM 4.0) and all phones are
down..the error message on the phones is

DHCP 1653... secs. VLAN ID = 0.

how do we determine whats the problem? looks like DHCP server!

What commands i run and what do i check to narrow down the problem and resolve it?

fataldata · June 17th, 2008, 12:40 PM

It is definitely the connection to the DHCP server that has failed. You will probably be able to make the phone work by inputing the info manually. Try that, if the phone works then check DHCP.

There will be no way for the CM switch to help you if the IP phones do not have IP addresses and have not registered to CM.

Techman · June 17th, 2008, 05:21 PM

Replace the IP phone with a laptop and check if your DHCP works. If this one fails, then you have to verify your DHCP gateway or IP routes. Also try to "ping" your DHCP server to be sure.

June 16th, 2008, 05:04 AM	#1 (permalink)
sha111 PBXtech SILVER 25+ posts Join Date: Oct 2007 Posts: 77	ALL IP phones not working We have remote site connected to hubsite(s8720,CM 4.0) and all phones are down..the error message on the phones is DHCP 1653... secs. VLAN ID = 0. how do we determine whats the problem? looks like DHCP server! What commands i run and what do i check to narrow down the problem and resolve it?

June 17th, 2008, 12:40 PM	#2 (permalink)
fataldata PBXtech PLATINUM 300+ posts Join Date: Jul 2003 Posts: 309	Re: ALL IP phones not working It is definitely the connection to the DHCP server that has failed. You will probably be able to make the phone work by inputing the info manually. Try that, if the phone works then check DHCP. There will be no way for the CM switch to help you if the IP phones do not have IP addresses and have not registered to CM. __________________ Systems In Use: S8700 CM3.0 and S8710 CM3.1.1 Last edited by fataldata; June 17th, 2008 at 12:43 PM.

June 17th, 2008, 05:21 PM	#3 (permalink)
Techman Join Date: May 2007 Posts: 4	Re: ALL IP phones not working Replace the IP phone with a laptop and check if your DHCP works. If this one fails, then you have to verify your DHCP gateway or IP routes. Also try to "ping" your DHCP server to be sure.

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