DHCP and Mitel IP Phones

[J001]

Hello,

I have configured option 125 on DHCP server for the Mitel phones to do IP discovery. The cisco switch is only configured with switch mode access.

Is it necessary to have a. Voice vlan or should this work ?

At the moment we have one site that has a flat network with no separate voice and data vlans.

The Mitel works with voice and data vlans but for some reason the Phones do not pick up an IP address when there is no switchport voice vlan ?

Is this required ?

 

[LoopyLou]

We have a site with a flat VLAN running both PC's and IP sets. It works fine. You don't really need a VLAN for the phones its just a method of seperating voice packets from data packets. Not sure what you are seeing on the phones but they should issue a DHCP request and if the receive an IP address and necessary options, thats about it.

 

[JimHilton]

Hi, what are you seeing on the sets?

Also are you running another DHCP server on the same subnet?

As a prove out, you could program the set with a static IP. (I think holding 7 down and powering up the set will give you the basic prompts you'll need).

Jim

 

[kwbMitel]

Required? .. No

Recommended? .. Absolutely!

Typical Switch Port Setup.

Dedicated data Devices connected to ports that are Untagged on Data VLAN. Voice VLAN Denied

Phone Controller connected to a port that is Untagged on Voice VLAN (Data VLAN Denied)

Phones are connected to ports that are untagged for Data and Tagged for Voice.

DHCP is setup to tell the phone to switch to the voice vlan with tagged packets.

PC's connected behind the phone will communicate on the untagged Data VLAN.

*******************************************************
Occam's Razor - All things being equal, the simplest solution is the right one.

 

[slapin]

When you configure Voice VLAN don't forget to check L2 QoS settings. Plus ports should be configured in trunk mode or "desired" when they will switch to trunk mode when find VLAN tags in Ethernet frames.

Check this out:

http://www.dslreports.com/faq/13324

I don't recommend copy/paste it, rather use like a guideline. For example I don't remark traffic in data vlan. Some of the applications running on your computer may need those marks to work properly. In simple words you got to know what you are dealing with.

 

[Opsmgr06]

Jaymis45,
You may want to think about your setup I support kwbmitel's statement on VLAN's.
Also a flat LAN will lead to voice quality issues, hence the use of VLANs to separate voice and data traffic as VOIP is UDP and Data is TCP.
In terms of DHCP on a flat LAN the MN3300 DHCP will be
"crushed without mercy" by the DC Server DHCP,so separate vlans are required, if you do separate yourvoice and data ensure your NT DHCP server is in a port that is a member of the data vlan only.
Also for Mitel support you would be told to implement VLANs should you have any issues, with voice quality etc.

Holding key 7 down instigates the teleworker address and just replaces the TFTP/ICP section with a static address,
which you can input just the RTC address of the MN3300 everything else is still dhcp.
Hold the up vol key down reboot then follow the menu for network parameters - yes then set the static settings of phone address/subnet mask/default gateway, tftp server and ICP is the RTC address of the MN3300 ignore the VLAN/Priority stuff as you haven't set it up by looks of your original post.

PS kwbmitel - I am man and boy Mitel cut my teeth on S/SG/VS and SX2000 M-stream and have been with the MN3300 since the SX2000 NT days

 

[J001]

Thank you for your responses. Mitel have a configuration tool for configuring DHCP. Had to leave the vlan entry as blank to get this to work.

All working now.