User's Manual 320 Document #: LTRT-10532
Mediant 500L Gateway & E-SBC
15.9.2 Configuring the Device for Skype for Business Presence
The following procedure describes how to configure the device for notifying Skype for
Business Server of presence status of Skype for Business users when making and
receiving calls using third-party, endpoint devices.
To help you understand the configuration, the following lists in chronological order the main
processing steps:
1. The device receives an incoming call.
2. The device uses a Call Setup Rule to perform LDAP queries on the Microsoft Active
Directory to retrieve Skype for Business usernames (Request URIs) for the
corresponding calling (source) and/or called (destination) number. For SBC, the Call
Setup Rule is associated with the classified source IP Group (in the IP Groups table).
For Tel-to-IP Gateway calls, the Call Setup Rule is associated with the destination IP
Group (in the Tel-to-IP Routing table).
3. The device routes the call to the required destination, according to the normal routing
rules.
4. When the call is connected, the device sends a SIP PUBLISH message to Skype for
Business Server, indicating that the users' presence status is now "On-the-Phone".
5. When the call ends, the device sends another SIP PUBLISH message to the Skype
for Business Server, clearing the users' "On-the-Phone" status (the presence status
changes to what it was before the call was connected).
To configure the device for Skype for Business presence:
1. Enable the Microsoft presence feature: open the SIP Definitions General Settings
page (Setup menu > Signaling & Media tab > SIP Definitions folder > SIP
Definitions General Settings), and then from the 'Enable MsPresence message'
drop-down list, select Enable:
Figure 15-63: Enabling Microsoft Presence Integration
2. Configure a TLS Context (TLS certificate) for secured communication (mutual
authentication) between the device and the Skype for Business Server (see
Configuring TLS Certificate Contexts on page 113).
3. Configure a Proxy Set to define the address of the Skype for Business Server (see
Configuring Proxy Sets on page 378). Make sure you configure the following:
• 'TLS Context Name': Assign the TLS Context that you configured in Step 2
(above).
• 'Proxy Address': Configure the address (FQDN or IP address).
• 'Transport Type': TLS
4. Configure an IP Group to represent the Skype for Business Server (see Configuring IP
Groups on page 363). Make sure that you assign it with the Proxy Set that you
configured in Step 3 (above).
5. Assign the IP Group of the Skype for Business Server as the destination (presence
gateway) to where the device must send the PUBLISH messages: open the SIP
Definitions General Settings page (Setup menu > Signaling & Media tab > SIP
Definitions folder > SIP Definitions General Settings), and then in the 'Presence
Publish IP Group ID' field, enter the IP Group ID of the Skype for Business Server that
you configured in Step 4 (above):
Figure 15-64: Assigning IP Group of Presence Gateway
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