Integration of CUM with Microsoft Lync

Microsoft Lync Server communications software can send and receive calls with Cisco Unified Communications Manager (CUCM) by using Direct SIP instead of using IP Phones.

Cisco Unified Communications Manager to exchange calls with Lync by using Direct SIP:

1. Configure SIP Trunk.
2. Configure translation pattern.
3. Configure route pattern.
4. Configure SIP gateway.
5. Configure mobility.   

Configure Lync Server for SIP Integration with CUCM.

1. Add CUCM to the Lync topology.
2. Configure the dial plan.
3. Add voice policy and route.
4. Add Trunk configuration. There are three parameters that need to be configured through the Windows PowerShell command line interface because they are not configurable on Lync Server Control Panel:

 i. Set-CsTrunkConfiguration –identity <Trunk name> –RTCPActiveCalls $false –RTCPCallsonHold     $false

ii. Set-CsTrunkConfiguration –identity <Trunk name> –EnableSessionTimer $true

iii. Set-CsMediaConfiguration –identity Global -EncryptionLevel SupportEncryption