Unanswered Question
Jun 29th, 2007

Welcome to the Cisco Networking Professionals Ask the Expert conversation. This is an opportunity to discuss with Cisco experts Aleem Rizvan and Mike Coffin how VoWLAN extends office calling features to wireless phones including wireless IP phones and dual mode cellular handsets. As a senior manager of product management in Wireless Networking Business Unit (WNBU), Aleem leads a team of product managers focusing on the definition and development of Advanced Mobility Services for the Cisco Unified Wireless Network. Mike works in the IP Communications Business Unit as a technical marketing engineer focusing on Cisco Unified Communications Mobility products such as the Cisco Unified Wireless IP Phone 7920, Cisco Unified Wireless IP Phone 7921G, dual-mode phones, Cisco Unified Mobility and Cisco Unified Communications Manager.

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thomas.chen Mon, 07/02/2007 - 08:20

Hello Aleem and Mike,

Can you tell me how I should configure security on my VoWLAN solution?



micoffin Tue, 07/03/2007 - 11:01

Hi Tom,

There are several layers of security to consider. First you'll want to consult your customer/companies preferred encryption level and ensure that any handset that you choose will support this. Next, you'll also want to determine what type of authentication works best for your deployment. We typically see something like EAP-FAST or EAP-TLS in use. When using these protocols it is important to understand that while they improve security, they also require more infrastructure to support and also can affect roaming times. To mitigate roaming delay it is recommended that CCKM be used, and also to account for any network delay associated with an authentication server that is not local. Hope this helps. -Mike

bbaley Thu, 07/05/2007 - 09:36

Cisco recently announced the availability of dual-mode phones with Nokia. Can you elaborate on this?



rizvan Thu, 07/05/2007 - 11:41

Hi Bill,

Yes, Cisco and Nokia announced the availability of Dual-mode (WiFi and Cellular) handsets from Nokia that run the Cisco SCCP client on them. These phones can be configured to operate as Wireless IP Phones in a Cisco Unified Wireless Network and Cisco Unified Connection Manager solution.

The phones operate as standard cellular handsets when outside the Cisco Unified Wireless Network.

The solution is available and shipping now.



kds30136 Fri, 07/06/2007 - 05:06

Can you be more specific with the model number of the dual band Cell/WiFi phone that Cisco will be supporting? I'm not able to find it.

rizvan Fri, 07/06/2007 - 08:52

Hi Keith,

The certified Nokia devices at present are the E61, E61i and E65.



kds30136 Mon, 07/09/2007 - 10:25

This is a two part question:

1. What CM software revision supports the Nokia Devices?

2. Do you think Networkers will have some sort of a demo?

rizvan Mon, 07/09/2007 - 13:27

Hi Keith,


Nokia dual-mode solution is supported in the following release trains:

- Cisco Unified Communications Manager: 4.x and 5.x

- Cisco Unified Communications Manager Express: 4.x

At the time the Nokia dual-node solution went FCS, the CUCM 6.0 release was not out. So, we plan to support CUCM 6.0 in the next dual-mode solution release planned for 4QCY07.


Nokia will have a booth at Networkers where they are planning to demo the Dual-mode solution. Please stop by, if you are going to be at Networkers.



axfood Mon, 07/09/2007 - 06:43


Are there any Dual-mode (WiFi and Cellular) handsets that use SIP insted of SCCP that is supported by Cisco Unified Connection Manager.

We think that the new "Cisco Unified Mobile Communicator" is the future for enterprise.

Look like a outstanding solution.

But the time to mark and more brand of handsets is importent.



rizvan Mon, 07/09/2007 - 11:32

Hi Christer,

Thanks for the feedback on Cisco Unified Mobile Communicator. We are pretty excited by that technology and look forward to supporting it on a number of handsets in the future.

As far as dual mode devices are concerned, we have to date announced Nokia (which uses SCCP) and NTT DoCoMO (which uses SIP) handsets. They are both supported on the Cisco Unified Communications Manager today.



alb111111 Thu, 07/05/2007 - 13:03


How close do the access points have to be to have a dead spot free vowlan? Generally speaking.

rizvan Thu, 07/05/2007 - 14:16

Hi Albert,

In general we recommend a design with a minimum power of -67 dBm at the cell boundary. The adjacent channels have to be non-overlapping and provide for at least 20% overlap to ensure better phone performance in the 802.11b/g environment.

There is more information in the following doc, Chapter 11 VoWLAN Design Recommendations.

Hope this helps.



rizvan Thu, 07/05/2007 - 22:26

Oops....I meant to say the Cisco Unified Communications Manager and not Cisco Unified Connection Manager. Don't want to get in trouble with the naming police :-)



bbaley Mon, 07/09/2007 - 09:50


Is QoS supported on the WLAN Infrastructure for Voice?

Thanks Bill

rizvan Tue, 07/10/2007 - 11:02

Hi Bill,

The Cisco Unified Wireless network has long provided advanced QoS capabilities for delay and latency-sensitive traffic like Voice and Video. WMM QOS is supported today on the WLAN infrastructure components.



johnnylingo Tue, 07/10/2007 - 12:47

Was wondering if you could provide some general pointers / documentation on configuring QoS for Wireless. Specifically, we're a mix of 7920/7921G phones, 1242/1231 APs, 3750/3650 switches at the access/distribution layer, and 6500 with Native mode at the core.

axfood Fri, 07/13/2007 - 01:11

I can only agree, that is a very common envirment with 7920 and want?s 7921.

Way do so many updated documents only mention 7920 when probely most new and existing want to go for the 7921.



josequiros Tue, 07/10/2007 - 09:17


I've a question to how configure Nokia E65 to work with call Manager 5.1.

Thank you in advance

josequiros Tue, 07/10/2007 - 10:01


I've a question to how configure Nokia E65 to work with call Manager 5.1.

Thank you in advance

rafiqkhan Wed, 07/11/2007 - 07:26

Hi Rizwan,

Just to gain some clarification on the fixed -mobile converged IP solution (dual-mode phone technology):

1. Will this solution work with the Cisco Unified Communications Manager (Business Edition), if not when is it likely to be supported

2. If I wanted to design a dual-mode GSM/WiFi solution would the following components be adequate:

Unified Communications Infrastructure - Cisco Unified Communications Manager

Unified Wireless Network Infrastructure - based on 1010 access points and 4400 series controllers

Phones - the Nokia dual-mode phones

3. Does the dual-mode phone automatically switch between the GSM and WiFi networks, or is a manual intervention required

Thanks in Advance

micoffin Thu, 07/12/2007 - 07:02

Some answers:

1. Yes! All mobility functionality is in Business Edition.

2. The 1010's with a controller will work.

3. This depends on what type of "switching" you are referring to. The Nokia's can detect when the wi-fi network is in range and automatically register to Communications Manager. However, if you are on a GSM (or Wi-Fi) call and move into range of the other technology it will not seamlessly transfer the call. We hope to see this in a future release.


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