Also, ensure that the Cisco ER configuration for the Cisco CallManager cluster is correct. The Cisco ER configuration should show the correct beginning address for the Telephony ports you defined as CTI ports in Cisco CallManager, and the number of Telephony ports should be the correct number. It must be greater than 0 for any calls to occur. Cisco ER uses these CTI ports to place the telephone calls to onsite alert personnel.
If the Microsoft Windows Event Viewer shows the No port to place call error message, this means that there were not enough CTI ports defined to initiate all the calls to onsite alert personnel. Define more ports.
For more details on resolving Cisco Emergency Responder issues, refer to these documents: