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ICE SIP Registrar / CUCM Configuration
This section provides instructions for configuring a Cisco Unified Call Manager/SIP Registrar.
Important: Before configuring users and Directory numbers on ICE Server, the end users and 3rd party SIP devices with corresponding Directory Numbers must first be created first on the CUCM/SIP Registrar.
Log in to CUCM/SIP Registrar as admin to configure end users with SIP digest authentication and proceed to configure 3rd party SIP (advanced) devices associating end users and unique Directory Numbers.
To configure the ICE Server
1. Using ICE Desktop, login to Server as an administrator and perform the following:
2. In Settings->Call Manager,
A. Add your Call Manager/SIP Registrar to the ICE Server.
B. Fill the mandatory fields of Name and IP Address along with port 5060.
3. Description is an optional field
4. In Settings > People,
5. Configure users with assigned Directory Number(DN), Username, password. These fields need to match with what is configured on CUCM. Example : If DN 12345 has enduser johndoe with authpassword 12345 on CUCM, configure the same on ICE Server
6. In Settings > Channels,
Configure few channels with assigned DNs. DN, Username, and password need to match with what is configured on CUCM and need to be unique. 
Note: DNs/Username/password from one user cannot be repeated for other users as these DNs need to register to Call Manager.
To verify ICE Telephony Call-Flow after installation
*Dial-in from a Cisco IP Phone(all supported models) calling assigned channel's number and confirm that ICE Android/ICE Desktop can hear audio when IP Phone presses *. IP Phone user can end PTT with #. IP Phone can hear audio when ICE Desktop/ICE Android speak on that assigned channel. IP Phone can end the call. Many IP Phones can dial to same channel but only one user will have floor control
*Direct dial-in Call from IP Phones to ICE users using Directory number of ICE Android/Desktop users
*Dial-out from ICE Desktop\'s/ICE Android's dial pad to IP Phones; ICE users can also use Redial using call history tab
*Private Calls between ICE (Desktop and Android) users using Telephone icon