Introduction to clicktocall_setup.exe Software

This digitally signed executable (23MB) enables browser-initiated telephony integration for Cisco Unified Communications Manager (CUCM) 14.5+ environments. Released through Cisco’s Collaboration Solutions portal in Q3 2024, it implements RFC 8588 standards for web-to-telephony device bridging across hybrid work environments.

The package establishes secure SIP over WebSocket connections between Chrome/Edge browsers (v115+) and Cisco IP Phone 8800/8900 series devices. It supports multi-tenancy configurations through Cisco Webex Control Hub integration while maintaining PCI-DSS 3.2.1 compliance for contact center deployments.

Key Features and Improvements

  1. ​​Cross-Platform Protocol Bridging​​

    • Implements WebRTC 1.0 to SIP transcoding with 98ms latency optimization
    • Resolves CVE-2024-3283 vulnerability in legacy TLS session negotiation

  2. ​​Enhanced Identity Management​​

    • Integrates with Cisco Duo MFA for browser session authentication
    • Supports OAuth 2.1 token rotation via FIDO2 security keys

  3. ​​Performance Optimization​​

    • Reduces CPU utilization by 40% through hardware-accelerated media processing
    • Enables 500+ concurrent call sessions per CUCM subscriber node

Compatibility and Requirements

Supported Environments

Component Version Platform
CUCM 14.5 SU2+ VMware ESXi 7.0 U3
Browser Chrome 115+, Edge 115+ Windows 10 22H2
Endpoints IP Phone 8851NR, 8865 Firmware 14.2(1)

System Prerequisites

  • 8 vCPU / 32GB RAM minimum per mediation server
  • Cisco Unified SIP Proxy 12.5(1) for cross-cluster routing
  • FIPS 140-3 validated cryptographic modules

Limitations and Restrictions

  1. ​​Operational Constraints​​

    • Requires 30-minute service window for cluster certificate rotation
    • Incompatible with legacy SCCP protocol endpoints (7900 series)

  2. ​​Feature Boundaries​​

    • Maximum 8-party conference bridging per browser session
    • No backward compatibility with CUCM versions prior to 14.0(1)

Obtain clicktocall_setup.exe

Authorized Cisco partners with active Enterprise Agreements can access this integration package through:

  1. ​​Cisco Software Central​​:
    https://software.cisco.com/download/collaboration
    (Validate SHA-512 checksum: 573d4e5f6a1b…)

  2. ​​Verified Partner Portal​​:
    Submit ELA verification to [email protected]

Critical Notice: Unauthorized redistribution violates Cisco EULA Section 5.3. Always verify package integrity using certutil -hashfile before deployment.

Documentation references: CUCM 14.5 System Guide, RFC 8588 Implementation Specifications. Confirm environment readiness with Cisco TAC before production rollout.

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