Mino – The UC Guy

Microsoft Unified Communications Blog

How to Integrate Exchange UM Voicemail into Cisco IP Phones

Posted by Mino on March 27, 2009

I am working with a client who is using Cisco CUCM with Cisco Phones, along with Microsoft Exchange 2007 voice mail on the UM , but when you divert the phone to voicemail you are not prompted with the users voicemail prompt – you are prompted with the Subscriber access greeting of “ Welcome , you are connected to Microsoft exchange ,…etc )

Usually when you call someone and there is no answer then you are transferred to the Pilot number, the extension of the person you are calling is sent also in the request so that you would be directly transferred to the users voice mail not to the Welcome greeting.

This Problem Happens when Diverted Calls are not accepted because both sides cannot agree on DTMF handling , the MTP is important, because it deals with differences in how DTMF is signaled between the phones and gateways and the sip trunk

Just make sure the following on the Cisco SIP trunk:

  1. Accept Out-of-Dialog REFER
  2. Accept unsolicited Notification
  3. Accept Replaces Header
  4. Have the SIP trunk configured to use MTP, once I’d configured MTP and MRG/MGRL

The changes detailed below are based on a new installation of Call Manager 5. As this environment been created for the purpose of testing the integration between platforms, it contains only minimum configuration. The required Changes are with:

·         Media Termination Point (MTP)

·         Changes to security profile

Media Termination Point: The Cisco Call Manager installation builds the default media termination point.

Media Resource Group: Create a media resource group “MRG_CCM5” and add the media resource (MTP) to the group. Multicast is not required.

Media Resource Group List: Create a media resource group list “MRGL_CCM5” and add the media resource group “MRG_CCM5” to the list.

Device Pools: By default Cisco Call Manager creates the “default” device pool. Open the device pool “default” and select the new media resource group list “MRGL_CCM5”.

SIP Trunk Security Profiles: Copy the “Non Secure SIP Trunk Profile” to “E2K7 Non Secure SIP Trunk Profile” and enable “Accept Unsolicited Notifications”.

Partition Configuration: Create a Class of Control Partition “Local”.

Calling Search Space: Create a Class of Control Calling Search Space “CCS_Local” and add the Partition “Local” to the calling search space.

Trunk Configuration:

Trunk Configuration



Device Name



Exchange UM

Device Pool


Call Classification

Use System Default

Media Resource Group List




AAR Group


Packet Capture Mode


Packet Capture Duration


Media Termination Point Required


Retry Video Calls as Audio


Transmit UTF-8 for Calling Party Name


Unattended Port


MLPP Domain Information



Trunk Configuration
Call Routing Information


Inbound Calls

Significant Digits


Connected Line ID Presentation


Connected Name Presentation


Calling Search Space


ARR Calling Search Space


Prefix DN


Redirecting Diversion Header Delivery


Outbound Calls

Calling Party Selection

First Redirect Number

Connected Line ID Presentation


Connected Name Presentation


Caller ID DN


Caller Name


Redirecting Diversion Header Delivery


Trunk Configuration

SIP Information


Destination Address

<IP Address of E2K7 Server>

Destination Address is an SRV


Destination Port


MTP Preferred Originating Codec


Presence Group

Standard Presence Group

SIP Trunk Security Profile

E2K7 Non Secure SIP Trunk Profile

Rerouting Calling Search Space


Out-of-Dialog Refer Calling Search Space


SUBSCRIBE Calling Search Space


SIP Profile

Standard SIP Profile

DTMF Signalling Method

No Preference

8 Responses to “How to Integrate Exchange UM Voicemail into Cisco IP Phones”

  1. Nicolas said

    What about the MWI ?

  2. Ids said

    MWI has to be handled with an external MWI application such as Geomants MWI app (www.mwi2007.com)

    Good article though. Have you had any joy with getting the Messages pilot to work. When my users are configured with Exchange as their VM, they are prompted to enter their extension and PIN. So it seems forwarding of their DN does not seem to work ….. Any ideas ?

  3. Mino said

    The Problem you are having is due to mismatching in the DTMF language between the OCS and the Cisco , or maybe you have enbaled the users on the UM with diffirent extensions than the Cisco one.

    if both extensions are the same then you should check the DTMF options in the Cisco and try to change it and test again.

    You should know that when you call the UM voice mail from the Cisco phone set , the cisco sends the packet with the extension embeded in it and this is when the exchamge UM understands whose mailbox is that and it wont prompet for the extension again.
    so if this is not happening then it is for sure the DTMF on the Cisco

  4. Mark said

    Is the DTMF language difference when dealing with CUCM going to EUM via Direct SIP or via T1s?

  5. Katie Tam said

    Just because Goog is going to test a broadband deployment doesn’t mean that Cisco responded to somehow 1-up Google. Cisco hasn’t even been in the broadband / SP business, other than on the edge with cheap boxes aka Linksys. I wrote up more about Goog’s reasons for pulling the trigger on broadband and I agree with the above commenter – Gb EPON is the reason.

  6. Hello Mino

    Do i need to have Cisco voicegateway such as AS5300 or ASA5350? or just a low-end Cisco Router with voice module.

    Thank You Very Much

  7. Tom said

    Take a look at http://www.visualviewmail.com. This program Integrates Exchange UM Voicemails and allows Cisco IP phone users to see all of their voicemails, conference room calendars and outlook contacts from their phones. It works with CUCM and CUCME.

  8. Hi,
    Do you have updated article or have you tried Cisco 7 integration with Exchange 2010 UM?

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: