Telephony
Phone systems that stop losing you calls.
We design, develop and integrate custom VoIP systems for businesses that need more than a traditional desk phone. Cloud PBX, SIP trunking, intelligent call routing, IVR and CRM integration, built on Asterisk and FreePBX and shaped around the way your team actually works.
VoIP Systems Built Around Your Business
Most businesses end up reshaping the way they answer calls to suit whatever phone system they bought. We work the other way round: we start from your call flows, your team structure and the software you already run, then build the telephony to match.
Custom Workflows
Call handling built around how your business actually operates, from the first ring through to resolution.
Business Integration
Telephony connected to your CRM, internal applications and existing APIs so nothing is retyped by hand.
Scalable Architecture
Systems designed to grow with new users, extra sites and higher call volumes without a rebuild.
Automation
Less manual work through automated routing, callbacks, notifications and voice automation.
VoIP Development Services
Development, integration and support across the full telephony stack. Everything below is delivered as a development project, scoped around your requirements rather than sold as a fixed package.
Custom VoIP Software Development
Voice applications built to your specification, from call handling logic to internal tools and reporting.
Asterisk Development
Custom dialplans and telephony applications built on Asterisk using AGI, AMI and ARI.
FreePBX Development
Custom modules, configuration and integration work on new or existing FreePBX installations.
SIP Integration
Connect desk phones, softphones, gateways and third-party platforms over SIP.
SIP Trunking
Provision and configure SIP trunks, with least-cost routing and failover between providers.
Cloud PBX Development
Hosted phone systems for distributed teams, with central management and per-site call flows.
IVR Development
Menus, prompts and self-service flows that get callers to the right place the first time.
Custom Call Routing
Route by business hours, department, skill, location, priority or data from your CRM.
Call Centre Software
Queues, agent states, wallboards, recording and reporting for inbound and outbound teams.
WebRTC Development
Browser-based calling so agents can work from a web application without a desk phone.
VoIP API Integration
REST APIs and webhooks that let your applications originate, control and track calls.
CRM & VoIP Integration
Screen pops, click-to-call and automatic activity logging inside the CRM your team already uses.
Call Recording
Recording, secure storage and retrieval, with retention rules that match your policy.
Click-to-Call
Dial straight from a CRM record, web app or internal tool with a single click.
Voice Automation
Automate repeat call handling: notifications, confirmations, callbacks and status updates.
AI Voice Integration
Connect AI voice agents and speech services to your call flows where they genuinely help.
Asterisk & FreePBX Development
- Custom dialplans and call logic
- IVR menus, prompts and self-service flows
- Call queues and agent handling
- SIP trunk and endpoint integration
- Call recording and storage
- AMI, ARI and REST API development
- CRM and business-system integration
- Business-hour and holiday routing
- Custom call flows for your workflows
Cloud PBX Development
Custom cloud-based PBX systems for businesses that no longer sit in one building. We build hosted phone systems that keep numbers, extensions and call flows under central management, while your people work from offices, homes and mobile devices on the same system.
- One phone system across every office and remote worker
- Central management of numbers, extensions and call flows
- SIP connectivity to the providers and devices you choose
- Call flows configured per site, team or business hours
- Connected to the business software your team already uses
Centralised Management
Numbers, extensions, users and call flows all administered from one place.
Remote & Hybrid Teams
People keep the same extension whether they are at a desk, at home or on a mobile.
Multiple Locations
Several sites under one dial plan, with free internal calling between them.
Scalable Extensions
Add users, teams and sites without re-architecting the phone system.
Custom Call Routing & IVR
We develop the routing and IVR logic that decides where every call goes. Business hours, department, skill, location, queue position and customer priority can all feed into that decision, using Asterisk and FreePBX dialplans or data pulled live from your CRM.
- Business-hours and out-of-hours routing
- Holiday and exception schedules
- Department, team and skill-based routing
- Geographic and location-based routing
- Queue routing with position and wait handling
- Priority routing for key customers
- Overflow and failover when queues are busy
- Multi-language IVR menus and prompts
- Escalation rules for unanswered calls
- CRM-based routing on live caller data
Connect VoIP With Your Business Software
A call nobody logged is a lead you cannot follow up. We connect your phone system to the CRM, ticketing system and internal applications your team already uses, through REST APIs, webhooks and native integrations, so calls, recordings and outcomes land against the right customer record without anyone typing them in.
- CRM systems and sales platforms
- Ticketing and customer support tools
- Internal applications and customer databases
- REST APIs and webhooks for custom workflows
Automatic Call Logging
Every inbound and outbound call written to the customer record without manual entry.
Click-to-Call
Dial any number straight from the CRM, helpdesk or an internal tool.
Customer Identification
The caller record opens on screen before anyone says hello.
Call History
A complete call and recording history against each contact and company.
Lead Tracking
See which campaigns and numbers generate calls, and what happened next.
Automated Workflows
Trigger follow-up tasks, tickets and notifications from what happens on a call.
VoIP Solutions for Different Businesses
The same building blocks, assembled differently depending on what a team actually does all day.
Call Centres
Queues, agent management, call recording, live reporting and CRM integration for high-volume inbound and outbound teams.
Sales Teams
Click-to-call, automatic call logging and CRM integration, so reps spend their time selling rather than typing.
Customer Support
IVR, queues, escalation rules and full call history, so agents open every call already knowing the context.
Remote Teams
Cloud PBX with secure access from offices, laptops and supported mobile devices on one extension plan.
Multi-location Businesses
Geographically distributed offices connected through a single phone system, with internal dialling between sites.
VoIP Technologies We Work With
The platforms and protocols we build on. Which ones a project uses depends on its requirements, not on habit.
Asterisk
Custom PBX builds and telephony applications, including dialplan, AGI, AMI and ARI development.
FreePBX
PBX management and business phone systems, with custom configuration and module work.
PJSIP
SIP endpoint and trunk integration, including registration, NAT handling and codec negotiation.
Kamailio
SIP routing and load balancing for larger or more distributed VoIP infrastructure.
WebRTC
Browser-based voice, so calls can be made and received inside a web application.
Twilio
Programmable voice and communications APIs, where a hosted provider is the better fit.
The Right Technology for the Job
Some projects are best served by Asterisk or FreePBX, where you own the system outright and can change anything in it. Others are better on a commercial platform, where somebody else carries the operational load. We make that call on the merits of the project: what the business needs, what it costs to run, how maintainable it is, how far it has to scale, what it has to integrate with, and who owns it in five years.
- Business requirements
- Cost of ownership
- Maintainability
- Scalability
- Integration requirements
- Long-term ownership
From Requirements to Production
How a VoIP project runs with us, from the first conversation to the day your team is using it.
Understand
We map your existing infrastructure, call flows, integrations and the problems you actually want solved.
Design
We design the VoIP architecture, call flows and integration points, and agree them with you before any build starts.
Develop
We build the system, write the call logic and connect it to the applications it needs to talk to.
Test
We test SIP connectivity, routing, failover, recording and every integration under realistic conditions.
Deploy
We deploy, port or cut over, and support your team through the transition into day-to-day use.
What We Can Build
Examples of the kinds of systems we build. Each one is scoped around the requirements of the business it is built for, so treat these as starting points rather than fixed products.
Custom Call Centre Platform
A multi-agent VoIP platform with queues, agent states, call recording, live reporting and CRM integration, built around how your team is actually measured.
CRM-Connected Phone System
Incoming and outgoing calls associated automatically with the right customer record, with screen pops on answer and click-to-call from the CRM.
Multi-Office PBX
Geographically distributed teams on one unified phone system, with internal dialling between sites, shared numbering and per-site call flows.
Browser-Based Calling
Agents making and receiving calls inside a web application through WebRTC, with no desk phone and no softphone to install.
Why Businesses Choose Seninweb
We are a development team that works in telephony, not a reseller with a phone system to shift.
Custom Development
We build around the workflows you already have, rather than forcing the business into a fixed platform.
Open-Source Expertise
Hands-on experience with technologies such as Asterisk and FreePBX, down to the dialplan and module level.
Integration-First Approach
Telephony is only useful when it is connected. We link it to your CRM, APIs and existing business software.
Scalable Architecture
Systems designed so that new users, sites and requirements do not mean starting again.
Technology Flexibility
We choose the platform to suit the project, whether that is open source, a commercial product or both.
Frequently Asked Questions
Common questions about VoIP development, Asterisk, FreePBX and integrating telephony with business software.
What is VoIP development?
VoIP development means building and integrating a phone system in software rather than buying a fixed product. It covers the call logic, the routing rules, the integrations with your other systems and any custom applications built around the calls themselves, usually on platforms such as Asterisk and FreePBX or on programmable voice APIs.
Can you develop a custom Asterisk system?
Yes. We build Asterisk systems from the dialplan up, including custom call logic, IVR, queues, recording and applications built on AGI, AMI and ARI. That can be a complete new PBX, or a specific application that sits alongside the system you already run.
Can you develop or customise FreePBX?
Yes. We work on FreePBX at the configuration and code level: custom modules, dialplan overrides, integrations with other business systems and changes to how call flows behave. There is more detail on our FreePBX integration page.
Can you integrate VoIP with our CRM?
Yes. We connect phone systems to CRMs so calls are logged automatically, the customer record opens when a call is answered and agents can dial straight from the CRM. Where no native integration exists, we build one against the CRM’s REST API or webhooks. See CRM development for related work.
Can you build a cloud PBX?
Yes. We build hosted PBX systems that keep extensions, numbers and call flows centrally managed while your team works from offices, homes and mobile devices. It can run on your own infrastructure or with a cloud provider you choose.
Can you integrate SIP trunks?
Yes. We provision and configure SIP trunks, set up registration or IP authentication, handle codecs and NAT, and configure least-cost routing and failover so calls keep working if one provider has a problem. More on SIP trunking.
Can you build browser-based VoIP calling with WebRTC?
Yes. We build WebRTC calling into web applications so agents can make and receive calls in the browser, with no desk phone and nothing to install. It is normally paired with an Asterisk or Kamailio back end.
Can you customise an existing FreePBX installation?
In most cases, yes. We can usually extend what you already have rather than replace it, keeping your numbers, extensions and hardware in place while adding the routing, modules or integrations you need.
Can you migrate an existing PBX to VoIP?
Usually. We start by auditing the current system, numbering and call flows, then plan the trunking, hardware and cutover. Migrations are normally staged so calls keep running while the new system is proven.
Can VoIP calls be routed based on business hours?
Yes. Business hours, out-of-hours, holidays and exception schedules are standard parts of the dialplan. Calls can go to a different team, a voicemail box, an IVR or an on-call mobile depending on the time and day.
Can AI voice assistants be integrated with a VoIP system?
Yes. AI voice agents and speech services can be connected into your call flows, for example to handle first-line questions, capture details before a transfer or provide transcription. Our AI call center page covers this in more detail.
Have a VoIP System in Mind?
Tell us how your current phone system works, what you want to automate and which systems need to be connected. We can help determine the right architecture for your requirements.