Deployment Scenarios

Engineering work described without invented numbers

These scenarios document approach and reasoning. Client names, logos and performance metrics are not published unless a client has verified and approved them.

Call Centers

FreePBX consolidation for a multi-campaign call center

Challenge: Separate PBX instances per campaign had diverged in configuration, making audio faults and trunk failures difficult to diagnose.
Environment: Multiple Asterisk/FreePBX instances, mixed SIP carriers, agents on softphones across two sites.
Architecture: A consolidated FreePBX core with per-campaign contexts, carrier failover on the trunk layer and a separated media path for remote agents.
Implementation: Configuration was rebuilt from an inventory rather than migrated verbatim, with campaigns cut over one at a time inside agreed windows.
Security: TLS signalling, SRTP media, Fail2ban, restricted SIP source ranges and toll-fraud limits on outbound routes.
Testing: Concurrency, trunk failover, IVR paths and one-way audio scenarios were tested before each campaign cutover.
Outcome: A single documented telephony platform with consistent dial plan logic and a defined failover path. Quantified performance figures are not published without client-verified measurement.
Lessons learned: Rebuilding from an inventory exposed dial plan rules that no longer matched any live campaign.

SMEs

Proxmox migration of an ageing physical server estate

Challenge: Business applications ran on out-of-warranty physical servers with no consistent backup or recovery position.
Environment: Mixed Windows and Linux physical hosts, local storage, ad hoc file-level backup.
Architecture: A Proxmox VE cluster with shared storage, segmented management network and Veeam-based backup to immutable and offsite targets.
Implementation: Workloads were converted in dependency order with rollback retained until each service was validated in production.
Security: Isolated management VLAN, MFA on administrative access, hardened host baselines and separated backup credentials.
Testing: Restore tests were run for every migrated workload before the physical host was decommissioned.
Outcome: Consolidated compute with tested restores and documented runbooks. Cost and performance deltas are reported only where the client has verified them.
Lessons learned: Dependency mapping before conversion prevented a mid-migration outage on a shared database.

Professional Services

Email authentication rollout for a distributed services firm

Challenge: Legitimate mail was inconsistently delivered and the domain could be spoofed by third parties.
Environment: Microsoft 365 tenant with several third-party senders and an unmaintained DNS zone.
Architecture: A consolidated sender inventory, corrected SPF, per-sender DKIM signing and staged DMARC enforcement with reporting.
Implementation: DMARC moved from none to quarantine to reject as reporting confirmed each sender was aligned.
Security: Enforced authentication, removal of stale DNS records and monitoring of aggregate reports.
Testing: Authentication was verified per sender and reports reviewed across a full monitoring window before enforcement.
Outcome: Aligned, authenticated mail flow and an enforced DMARC policy. Deliverability improvements are described qualitatively unless the client publishes measured data.
Lessons learned: Most alignment failures came from forgotten marketing and application senders, not the primary tenant.

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