Cisco Call Manager and Exchange 2010 Unified Messaging


Recently had an implementation in between Cisco Call Manager 8 and Exchange 2010 SP2 Unified Messaging.  We followed the documentation from Cisco on how to configure the Cisco Call Manager:

Essentially here is the breakdown from the cisco side:

  1. Set up a SIP trunk from Cisco Call Manager to Exchange 2010 UM Server
  2. Create a pilot identifier that points to the UM Server, in our case 1000

Trust me, this is very light, but is meant for Exchange admins who are looking at how to configure the Exchange side of things.  One thing to note, the walkthrough does not tell you of an issue you need to watch out for, which is Exchange 2010 UM only speaks over G711, not G729.  Even if your SIP trunk is configured for G711, you need to make the following change in Cisco Call Manager:

System->Service Paramters

Select one of your call manager servers, and select the service Cisco CallManager (Active):

Change the Default Interregion Max Audio Bit Rate from the default setting of 8 kbps (G.729) to 64 kbps (G.722, G.711).  Otherwise you will get a fast busy when calling your voicemail.

So, here is our configuration:

(2) Cisco Call Manager Servers [] and []

(1)  Exchange 2010 UM Server []

Pilot Identifier = 1000

Number of digits in extension = 4

We need to create a UM Dial Plan. Navigate to Organization Configuration->Unified Messaging->UM Dial Plan->New UM Dial Plan


Here we set the digits to 4, the URI type to Telephone Extension, and since we are not using SIP with TLS, leave it as unsecured. Also, since we are North America, the country/region code is 1.

Click Next, and you can add nysrv2-um01 to the dial plan:


Open the dial plan you just created, as there are some settings we need to change:

Subscriber Access Tab

Add “1000” as Telephone number to associate:


Settings Tab

Change Audio Codec to G711


Save and close.

Next we need to add a new UM IP Gateway.

Go to Organization Configuration->Unified Messaging->UM IP Gateways->New UM IP Gateway

Create a separate UM IP Gateway for each cisco call manager, ensure to add the dial plan you created above:




You’ll notice also that you will get a “Default Hunt Group” listed underneath the IP Gateways if you associate it with a dial plan:


Creating the Dial Plan also automatically creates your UM Mailbox Policy, which you can check out at Organization Configuration->Unified Messaging->UM Mailbox Policies


This goes into the default pin settings for users mailbox’s, as well as features they can access.  Besides security purposes, there is not much to change here.

Next, enable a user for Unified Messaging by right clicking on his mailbox and selecting “Enable for Unified Messaging”


Set the Unified Messaging Mailbox Policy and set the PIN:


For the extension, if you have entered in the phone number in AD, it will automatically be filled in:


Once it’s done, your user will get an email letting them know they have been enabled for Exchange Unified Message:


You should be all set!

This entry was posted in Exchange 2010, Unified Messaging and tagged , . Bookmark the permalink.

3 Responses to Cisco Call Manager and Exchange 2010 Unified Messaging

  1. Pingback: Cisco Call Manager and Exchange 2010 Unified Messaging–Fast Busy Signal When Calling Voicemail « Exchange for the Working Man

  2. Jon says:

    Hey! Do you use Twitter? I’d like to follow you if that would be ok. I’m undoubtedly enjoying
    your blog and look forward to new posts.

Leave a Reply

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

You are commenting using your 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