Asterisk and CRM expertise, delivered as a service.
From first PBX install to custom CRM workflows, TechExtension's engineers plan, build and support the telephony infrastructure your business runs its calls on.
Every service a growing phone system needs, under one roof.
Most businesses don't need a dozen vendors to run their phone system — they need one team that understands Asterisk, the CRM their teams live in, and how the two should talk to each other. That's what TechExtension delivers: PBX builds, CRM integrations and the custom development in between, handled end-to-end by engineers who support what they ship.
Twelve service lines. One accountable team.
Engage us for a single service or the full lifecycle — from planning through long-term support.
Asterisk PBX Development
Custom Asterisk telephony systems engineered from the dial plan up — built around how your business actually routes and handles calls, not a generic template.
- Custom dial plans, IVRs and call-routing logic
- AMI/ARI-driven backend integrations
- Scalable architecture for growing call volumes
PBX Customization
Tailored modules, extensions and workflow logic layered onto FreePBX, Issabel, FusionPBX or VitalPBX so the platform fits your process instead of the other way around.
- Custom modules for FreePBX, Issabel, FusionPBX, VitalPBX
- Tailored call flows, queues and IVR menus
- Role-based extension and permission structures
CRM Integration
Bi-directional integration between your Asterisk-based PBX and the CRM your teams already run on, with screen pops, click-to-call and automatic call logging in real time.
- Real-time screen pops and caller lookup
- Automatic call logging and disposition sync
- Support for 9+ CRM platforms out of the box
Asterisk Consultancy
Architecture reviews, capacity planning and technology roadmaps from engineers who have deployed Asterisk in production contact centers, not just lab environments.
- Infrastructure and capacity assessments
- Security and compliance hardening guidance
- Vendor-neutral platform and codec recommendations
PBX Migration
Zero-drama migration from legacy phone systems or another PBX distribution to a modern Asterisk-based platform, with call history and configuration carried over intact.
- Configuration, extension and voicemail migration
- Parallel cut-over planning to avoid downtime
- Post-migration validation and call testing
PBX Installation
End-to-end installation and provisioning of your Asterisk-based PBX, from server hardening and trunk configuration through to handset and softphone rollout.
- SIP trunk and gateway configuration
- On-premise, hosted or hybrid deployment
- Handset, softphone and extension provisioning
PBX Support
Ongoing monitoring, tuning and incident response for production phone systems that can't afford unplanned downtime, backed by an SLA-driven support desk.
- Proactive monitoring and health checks
- SLA-backed incident response
- Regular patching, backups and tuning
Custom Development
Purpose-built modules and workflow logic for the moments an off-the-shelf integration isn't enough — written and maintained by the same engineers who support it.
- Bespoke modules for niche business logic
- Custom reporting and analytics dashboards
- Long-term maintenance and version support
API Integration
REST and webhook integrations that connect your PBX to helpdesk tools, marketing platforms, data warehouses and any other system that needs call context.
- REST API and webhook development
- Third-party helpdesk and marketing tool sync
- Authentication, rate-limiting and error handling
Call Center Setup
Full contact-center builds with skills-based queues, ACD routing, live wallboards and supervisor tooling designed for teams that live on the phone all day.
- Skills-based queues and ACD routing
- Live wallboards and supervisor dashboards
- Call recording and quality-monitoring setup
CRM Customization
Custom fields, workflows and telephony modules built inside your CRM so call data, dispositions and follow-ups fit the process your team already runs.
- Custom fields, modules and automations
- Telephony-aware workflow and lead routing
- Tailored reporting for call-driven pipelines
Click To Call Development
One-click dialing built directly into your CRM, helpdesk or internal tools, so agents place calls from any screen without ever touching a handset.
- One-click dialing from CRM and web apps
- Browser extension and embedded widget options
- Automatic call context and number formatting
Telephony specialists first — software builders second.
Six reasons IT and operations leaders bring their PBX and CRM work to TechExtension.
Telephony-First Engineers
We started with Asterisk deployments, not app development — every service reflects what actually holds up in a live call center.
Deployed in Days, Not Months
Guided implementation and reusable playbooks get most engagements to a working system in days rather than a lengthy custom build.
Security-First Delivery
Call data and credentials stay under your control, deployed on-premise or inside your own cloud environment.
Vendor-Neutral Advice
Not tied to a single CRM or PBX distribution, so recommendations are based on your stack, not ours.
Dedicated Engineering Support
A named engineer stays with your project from discovery through go-live, not a rotating support queue.
Transparent, Measurable Delivery
Every engagement ships against a documented scope and timeline, with progress visible at each milestone.
A predictable process, from first call to go-live.
The same six-stage process runs across every service line, so scope and timelines stay visible throughout.
Discovery
We map your current PBX, CRM and call workflows to understand what needs to connect and why.
Planning
A scoped technical plan with milestones, architecture and integration points is agreed before any build starts.
Development
Engineers build and configure the solution against the agreed plan, with regular progress check-ins.
Testing
Call flows, integrations and edge cases are tested under realistic load before anything reaches production.
Deployment
A planned cut-over — parallel where needed — moves the solution live with minimal disruption to your teams.
Support
Post-launch monitoring, tuning and an SLA-backed support desk keep the system reliable long after go-live.
Built for teams that live on the phone.
Asterisk and CRM workflows differ by industry — our engagements are shaped around how your team actually takes calls.
Ready to put this to work on your PBX?
Get a working environment set up with your own PBX and CRM, or talk to an engineer about your specific project.