Senior 3CX Engineer – Configure & Deploy On-Premise 3CX Phone System

Upwork Job Posting Senior 3CX Engineer – Configure & Deploy On-Premise 3CX Phone System Project Overview We are looking for an experienced 3CX Engineer to remotely configure and deploy a new on-premise 3CX phone system for one of our clients. The Windows Server (Windows Server 2025) has already been built and is ready for installation. We are looking for someone who has successfully deployed multiple production 3CX systems and can help us implement industry best practices from day one. Although this project is remote, you will work closely with our engineering team throughout implementation, testing, and documentation. Project Scope The selected contractor will be responsible for: Installation & Configuration Install and configure the latest version of 3CX Configure all system settings and licensing Configure extensions, users, departments, and ring groups Configure inbound and outbound routing Configure SIP trunks with carrier(s) Configure DID routing Configure outbound caller ID Configure emergency dialing Configure voicemail Configure digital receptionists (IVRs) Call Flow Design Design and configure call flows Build call trees and routing logic Configure queues Configure hunt groups Configure overflow routing Configure failover routing Configure voicemail routing Configure call recording (if required) Configure business hours and department hours Scheduling & Messaging Configure automated messaging for: After Hours Holidays Inclement Weather Emergency Closures Temporary Office Closures Special Announcements Integrations Assist with integration where applicable, including: SIP Providers Paging/Broadcast systems Existing applications Email notifications Microsoft 365 integration (if applicable) LDAP/Active Directory integration (if appropriate) Testing & Validation Work with our engineering team to: Perform system testing Validate call routing Test voicemail Test inbound/outbound calling Test failover scenarios Verify caller ID Validate integrations Resolve issues discovered during testing Documentation Create complete documentation that our technicians can use after the project is complete. Documentation should include step-by-step procedures for: Adding new users Adding new phones Provisioning phones Replacing a phone Resetting voicemail Configuring voicemail Changing business hours Updating holiday schedules Updating inclement weather messages Updating auto attendants Adding extensions Creating ring groups Creating queues Managing SIP trunks Backup and restore procedures Software updates Disaster recovery recommendations Best practices and ongoing maintenance Knowledge Transfer Review documentation with our team Answer implementation questions Assist during final acceptance testing Provide recommendations for long-term administration Required Experience Applicants should have: Extensive experience deploying production 3CX systems Experience with on-premise Windows Server installations Strong understanding of SIP trunk configuration Experience with call queues and IVRs Experience with call flow design Experience troubleshooting SIP issues Knowledge of VLANs, QoS, NAT, and firewall requirements Experience configuring supported IP phones Excellent documentation skills Strong communication skills Deliverables At project completion we expect: Fully operational production 3CX system SIP trunks fully configured Call flows fully operational Business hours and after-hours routing configured Holiday schedules configured Inclement weather routing configured Paging/broadcast integrations operational Complete administrator documentation Complete user administration guide Successful knowledge transfer session with our engineering team