All-IP Migration: Voice, Video, and Data Convergence on the Network

All-IP migration: voice + video + data converge on a single IP network, replacing TDM PBXs and separate networks. Challenges include QoS, reliability, and integration. 2026 migration guide for CIOs.

IP Convergence

• Voice: SIP VoIP (replaces traditional PBXs)
• Video: WebRTC, H.264/265, SIP
• Messaging: XMPP, Microsoft Teams, Slack
• Data: HTTP/HTTPS throughout
• IP Fax: T.38
• UC (Unified Communications): complete integration

Benefits

• Cost savings: 1 infrastructure instead of 3 (data + voice + video)
• Operational simplicity
• Mobility: softphone + mobile
• Modern features (video conferencing, chat, presence)
• CRM/ERP integration

Challenges

Mission-critical QoS

• Voice: EF 46, LLQ
• Video: AF41
• MOS score tests >4
• Application-aware SD-WAN

Reliability

• TDM PBX: native 99.999% availability
• VoIP: dependent on the IP infrastructure
• Solution: HA, redundancy, multi-link SD-WAN
• Backup: DECT over IP, mobile SIP

Security

• VoIP: ports 5060/5061; avoid exposure
• SBC (Session Border Controller): specialized VoIP firewall
• SRTP: media encryption
• TLS: signaling

Solutions

On-premises

• Cisco Call Manager (UCM)
• Mitel MX-ONE
• Avaya Aura
• 3CX (on a VM)
• Asterisk (open source)

Cloud (UCaaS)

• Microsoft Teams Phone
• RingCentral
• Zoom Phone
• 8×8 Experience Communications
• 3CX Cloud

Phased Migration

• Phase 1: pilot with 10-20 users (1-3 months)
• Phase 2: site-by-site rollout (6-12 months)
• Phase 3: legacy system decommissioning
• Ongoing user training

Migration Budget for 500 Users

• Softphones + licenses: ~€80k
• Infrastructure (SBC, QoS): ~€30k
• Migration services: ~€50k
• Total: ~€160k, excluding recurring UCaaS costs

Order from OPTINOC

Turnkey all-IP migration. Cisco UCM, Microsoft Teams, 3CX. QoS + SBC + SD-WAN. Quote within 48 hours.