Yasir@1995 did you verify that computer can ping the server address? It's possible there isn't a network path from the computer with the attendant console loaded but the other computer you're testing from does have a network path.
I have a troubleshooting guide we use when we have problems. Pasting the info below. Rather lengthy but hopefully something in this will help you with your problem.
Troubleshoot Invalid Extension Error or License File Error for Cisco Unified Attendant Console Standard
NOTE: Check Cisco online release notes for compatibility between Attendant Console and Windows 10
In CUCM go to User management>select the application user and check following
- Controlled Devices: check that device names are correct
- Permission Information: Include required roles are included based on installation guide
On Attendant Console PC
- Check that software for TSP and Attendant Console are installed
- Phones and Modem options: On Advanced Tab verify that Cisco TSP is a Provider (only 1 listed); can try to add manually; should by default be listed in Add Provider box; if not will need to research steps to add
- Open Cisco TSP Configuration program from Program Menu
- Telephony provider should be listed
- Select Configure
- Check that User should be CUAC4>check password/reenter
- CTI Manager Tab>should be IP address for CUCM
- Trace Tab>enable if needed for future reference
- Check that receptionist has Windows file permissions for Full Control, Modify and Write on following directories
- \ProgramFiles (x86)\Cisco\Unified Attendant Console Standard
- \Users\<windows user name>\AppData\Roaming\CUACSLayout
- \Users\<windows user name>\AppData\Roaming\CUACSLogging
- \ProgramData\CUACS
- Virus Scan must exclude these directories:
- \ProgramFiles (x86)\Cisco\Unified Attendant Console Standard
- \Users\<windows user name>\AppData\Roaming\CUACSLayout
- \ProgramData\CUACS
- Firewall must have exceptions for:
- Two-way TCP ports:
- Cisco Unified Communications Manager – Port 443
- Cisco Unified IM&P Server – Port 5222
- Cisco Webex Messenger Server – Port 5222
- TSP – Port 2748
- Two-way UDP ports:
- TSP Media Driver – Port range 50000-51019
- Reboot and login again
- Two-way TCP ports:
If problem still persists, complete following steps to reinstall Cisco Unified Attendant Console Standard
Programs required for Attendant Console on PC:
- Cisco Unified Attendant Console Standard
- Cisco Unified Communications Manager TSP-64bit – may be reinstalled separately if this is the cause of the issue
User must have access to following folders:
- \ProgramFiles (x86)\Cisco\Unified Attendant Console Standard
- \Users\<windows user name>\AppData\Roaming\CUACSLayout
- \Users\<windows user name>\AppData\Roaming\CUACSLogging
- \ProgramData\CUACS
Reinstall both TSP and Console
Uninstall Attendant Console Standard– Do not delete application database
- Cisco Unified Communications Manager TSP-64bit – deletes automatically with Console Standard software
- Locate Software. TAPI software can also be downloaded from CUCM. Go to Application>plug ins and locate Cisco TAPI 64 bit client and attendant console
Install Attendant Console Standard
- Locate CUACS_Setup executable – run as administrator
- Cisco UCM Connection Details
- Host Name – x.x.x.x
- CUCM application User ID – xxxxxx
- Password – xxxxxx
- Presence Server Connection Information
- Server Address x.x.x.x
- Domain – xxxxxx
- User Name – xxxxxx
- Presence Password – xxxxxx
Install TSP client
- Login with User with Admin rights on PC
- Locate CiscoTSPx64 executable and right click to Open as Administrator
- Click Next for # of TSPs to install 1
- Complete credentials
- UserID – xxxxx
- Password xxxxxxx
- Verify Password
- CTI Manager 1 x.x.x.x
- Protocol type (ipv4)
- Next
- Cisco Media Driver Configratiion
- UDP Port Range Start 50000
- UDP Port Range End 51019
- Auto-Upgrade Options - NEVER
- Next
- Uncheck Read Me file and Select Reboot
Reboot windows
