Posts tagged VOIP

Reboot i2002/i2004

0
October 27, 2007
by Michael McNamara in

A question that has often been asked by those working with these devices;

“How can you reboot/reset an i2002/i2004 without unplugging it?”

Well there is good news. You can reboot them without physically disconnecting the CAT 5e/6 cable (or the power supply if your not using the PoE functionality). The bad news is the key sequence is fairly complicated. The following key sequence will also work for all of Nortel’s Internet telephones (i2002, i2004, i2007, 1120e, 1140e, 1150e).

Here’s the key sequence you’ll need to follow;

  1. Mute key,
  2. Up Navigation key,
  3. Down Navigation key,
  4. Up Navigation key,
  5. Down Navigation key,
  6. Up Navigation key,
  7. Mute,
  8. 9,
  9. Goodbye key

Here’s a graphic that might make it a little easier to understand;


Once you strike those keys the i2002/i2004 Internet Telephone will reboot itself at which time you can reconfigure the phone by striking the four soft keys just below the display while the “Nortel Networks” logo displays on the LCD.

DHCP Options (VoIP) Part 2

17
October 25, 2007
by Michael McNamara in

In a previous article we reviewed how to configure a Nortel Ethernet Routing Switch 5520 using ADAC/LLDP (802.1ab) so a Nortel Internet Telephone could discover the voice VLAN ID automatically without manually configuration of the phone.

If you don’t have a switch that supports ADAC/LLDP you can still utilize automatic VLAN assignment using DHCP. I’ve actually used this method (before Nortel supported LLDP) and it works well but can sometimes be difficult to troubleshoot.

You’ll need to configure DHCP option 191 (string) with the following syntax;

VLAN-A:vvvv.

Where: “VLAN-A” Option 191 begins with this string for all Nortel IP phones.
“vvvv” The VLAN ID for the voice VLAN in decimal
Here’s an example if I were trying to assign the phones with a voice VLAN of 31;

VLAN-A:31.

There must be a colon (:) seperating the VLAN-A from the VLAN ID. The string must also end in a period. It may be necessary, depending on your DHCP server, to enclose the enter string in quotation marks.

How does it actually work?
With the phone and DHCP server configured properly here’s how it will work.

  1. The phone will boot up and make a DHCP request for option 191 in the Default VLAN of the port connecting the phone.
  2. If the phone receives a response to it’s request it will issue a DHCP Release of the address it received in Step 1.
  3. The phone will make a second DHCP request in the VLAN that was returned in option 191. The phone will be requesting DHCP option 128 from the DHCP server, this will include the Call Server information. (Note: if you use a sniffer you will see that the DHCP packets will have an 802.1q header with the appropriate VLAN ID)
  4. The phone will connect to the Call Server specified in DHCP option 128 and will prompt the user for the Node ID and TN information.

With all that said we did leave out one very important piece of the pie… the network switch configuration. You’ll need to configure the VLAN and QoS settings manually depending on the switch vendor.

Cheers!

DHCP Options (VoIP)

55
October 24, 2007
by Michael McNamara in

In this post I’d like to cover the DHCP options you’ll need to automatically configured the Nortel i2002/i2004 Internet Telephones as they boot. These DHCP options will actually work with any of Nortel’s Internet Telephones including the i2002/i2004/i2007/1120E/1140E and 1150E.

You’ll need to add a custom vendor DHCP option with a code of “128″ as a string value. You should name this DHCP option as “Call Server Information”. The value of this DHCP option will use the following format;

Nortel-i2004-A,iii.iii.iii.iii:ppppp,aaa,rrr;iii.iii.iii.iii:ppppp,aaa,rrr.

Where the following values are;

  • “Nortel-i2004-A” = Option #128 begins with this string for all Nortel IP phone sets
  • “iii.iii.iii.iii” = the IP Address of the Call Server (S1 or S2)
  • “ppppp” = port number for the Call Server
  • “aaa” = the Action for the Server
  • “rrr” = the Retry Count for the Server

The IP Address must be separated from the port number by a colon (:). The parameters for the Primary (S1) and the Secondary (S2) Call Servers are separated by a semicolon (;). The string must end a period (.).

For this example, enter the following:

Nortel-i2004-A,10.1.1.10:4100,1,5;10.1.1.20:4100,1,5.

This would equate with the following values;

  • Call Server S1 = 10.1.1.10
  • Port S1= 4100
  • Action S1= 1
  • Retry S1= 5
  • Call Server S2 = 10.1.1.20
  • Port S2 = 4100
  • Action S2 = 1
  • Retry S2 = 5

You can use the vendor class of “Nortel-i2004-A” if you’d like to build different scopes within your DHCP server. A default scope for all general devices and then a specific scope for any device that requests the vendor class of “Nortel-i2004-A”.

Let me make this comment… if your DHCP server mistakenly returns a DHCP response that does NOT include DHCP Option 128 the IP phone will just sit at the “Starting DHCP…” prompt. You need to make sure that you return DHCP Option 128 in the DHCP response to the phone.

This all assumes that you’ve setup a DHCP relay on the Voice VLAN on the core ERS 8600 switch or whichever switch you might be using as the router for that VLAN.

I’ll review the basic configuration of the ERS 8600 (core) in a subsequent post as it applies to the example configuration I’ve laid out in the past few posts.

Please feel free to drop a line if you have questions.

Cheers!

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