Can I hire an Asterisk developer for just a PJSIP migration project?

Yes. CelloIP offers project-based engagements. PJSIP migrations from chan_sip typically take 1-3 weeks depending on dialplan complexity.

Hire Dedicated Asterisk Engineers

Hire Expert Asterisk Developers
AGI · ARI · Dialplan · IVR

Pre-vetted Asterisk 20/21 engineers with deep AGI, ARI, PJSIP, and call centre expertise. NDA Day 1, full IP ownership. From $25/hr — 50%+ less than US agencies.

Get Matched in 24 Hours WhatsApp Us Now

Asterisk 20/21AGI / ARIPJSIP ExpertAI IVRCRM IntegrationHA Clustering

30+

Asterisk Engineers on Bench

48h

Guaranteed Start Time

Asterisk Versions Covered

$25

Starting Hourly Rate

500+

Asterisk Projects Delivered

12+

Years Asterisk Experience

Asterisk Technology Stack Expertise

Deep coverage across every Asterisk API, scripting layer, and integration surface.

Asterisk Core

Asterisk 20 LTS

Asterisk 21

chan_pjsip

chan_sip (legacy)

app_queue

Scripting / APIs

AGI (PHP/Python/Node)

FastAGI server

ARI REST

AMI socket

Stasis app

IVR / AI

GPT-4 integration

Whisper ASR

ElevenLabs TTS

Amazon Polly

Google TTS

Dialplan

extensions.conf

Macro/GoSub

AEL dialplan

Lua dialplan

app_directory

Database / CDR

MySQL CDR

PostgreSQL

Redis queue

ClickHouse CDR

Elasticsearch

DevOps

Docker

Keepalived HA

Prometheus metrics

Grafana dashboards

CI/CD pipeline

Asterisk Developer Roles Available to Hire

Senior Asterisk Developer

Senior (7+ yrs)

From $25/hr

Full-cycle Asterisk engineers who build complex dialplans, FastAGI pipelines, and ARI applications from scratch. Deep expertise in multi-tenant PBX, call queues, IVR, and conference bridges.

Asterisk 20/21AGI/FastAGIARIDialplanPJSIP

Typical projects:

Multi-tenant PBXCall centre ACDConference bridge

Asterisk Integration Developer

Mid–Senior (4+ yrs)

From $25/hr

Specialist in integrating Asterisk with CRMs (Salesforce, HubSpot, Zoho), helpdesks, and custom apps via AMI, ARI, and AGI. Real-time event handling and CTI screen-pop implementations.

AMIARI REST APICRM integrationWebSocketNode.js/Python

Typical projects:

Salesforce CTIHubSpot dialerReal-time dashboards

Asterisk AI/IVR Developer

Mid–Senior (5+ yrs)

From $36/hr

Builds conversational IVR using AI: GPT-4 intents, Whisper speech recognition, ElevenLabs/Amazon Polly TTS — all wired through Asterisk FastAGI with sub-500ms latency pipelines.

FastAGIPython/Node AGIGPT-4 IVRWhisper ASRTTS integration

Typical projects:

AI IVR GPT-4Whisper ASR pipelineVoice bot platform

Asterisk DevOps / Infra Engineer

Senior (6+ yrs)

From $34/hr

Asterisk infrastructure specialists: HA clustering with keepalived, real-time CDR to MySQL/ClickHouse, Prometheus metrics, Docker containerisation, and Kubernetes deployment.

High availabilityKeepalivedMySQL CDRPrometheusDocker/K8s

Typical projects:

HA Asterisk clusterCDR analyticsDocker deployment

Asterisk Development Use Cases

Call Centre / ACD Platform

Multi-queue ACD, agent login/logout, skill-based routing, real-time supervisor dashboards, call recording with CRM push

app_queueARIAMI

Conversational AI IVR

GPT-4 powered natural language IVR, Whisper speech-to-text, TTS playback, intent detection, context-aware routing

FastAGIGPT-4Whisper

Multi-Tenant PBX

Hosted PBX with tenant isolation, DID routing, extension management, call recording, portal API, white-label branding

FusionPBXPJSIPAGI

WebRTC + Asterisk Gateway

SIP-over-WebSocket bridge, browser softphone, DTLS-SRTP, coturn integration, click-to-call widget

chan_pjsipWebRTCSIP.js

PJSIP Migration

chan_sip to PJSIP migration for Asterisk 18+/20/21. Endpoint object model, TLS/SRTP upgrade, trunk reconfiguration

PJSIPchan_sipTLS/SRTP

CDR & Billing Integration

Real-time CDR to MySQL/ClickHouse, LCR billing API, invoice generation, fraud detection, balance alerts

MySQL CDRAGI billingLCR

CelloIP vs Competitors — Asterisk Developer Hiring

Platform	Hourly Rate	Asterisk Vetting	Time to Start	Certified
CelloIP ★ Best	$25–$38/hr	Asterisk-specific deep tech	48 hrs	In-house tested
Toptal	$90–$180/hr	General coding screen	2–3 weeks	Self-reported
Upwork	$20–$80/hr	Self-reported profile	1–5 days	Unverified
Fiverr Pro	$25–$60/hr	Portfolio review	1–3 days	Unverified
US VoIP Agency	$120–$200/hr	Agency team vetting	2–4 weeks	Agency-assured

How to Hire an Asterisk Developer from CelloIP

Share Asterisk Requirements

Tell us: Asterisk version, use case (PBX, call centre, IVR), integration targets (CRM, AI), experience level needed.

5 min

Matched Profiles in 24h

Receive 2–3 Asterisk engineer profiles with version-specific experience breakdown and project portfolio.

< 24 hrs

Asterisk Technical Interview

45-min live test: dialplan debugging, PJSIP config, ARI application walkthrough, AGI scripting challenge.

45 min

NDA + IP Agreement

NDA signed before any code discussion. IP assignment ensures your Asterisk deployment code belongs to you.

Same day

Dev Starts in 48h

Developer joins your repo, Slack, and Jira. Productive Asterisk development begins within 48 hours of contract.

48 hrs

Asterisk Hiring Guarantees

NDA on Day 1

NDA signed before any Asterisk code or architecture is shared. Your dialplan, routing logic, and integrations are protected.

Full IP Ownership

All Asterisk dialplan, AGI scripts, ARI apps, and configs written for you belong to you. IP assignment agreement included.

Available in 48 Hours

Asterisk developers from our pre-vetted bench start within 48 hours of contract signing.

Replacement in 2 Weeks

If the matched Asterisk developer isn't right within the first 2 weeks, we replace them at zero cost.

What Clients Say

“The Asterisk developer CelloIP matched rebuilt our multi-tenant PBX from scratch. His ARI knowledge and queue management expertise were exactly what we needed.”

— Head of Engineering, UCaaS Platform

United States

“PJSIP migration done in 3 weeks with zero downtime. The developer knew every edge case — topology hiding, TLS cert issues, SRTP incompatibilities.”

— CTO, SIP Trunking Provider

United Kingdom

“Our AI IVR went from prototype to production in 6 weeks. The FastAGI pipeline with Whisper and GPT-4 handled 50,000 calls/month from day one.”

— VP Product, Contact Centre SaaS

Australia

FAQ — Hiring Asterisk Developers

Q:How much does it cost to hire a dedicated Asterisk developer?

CelloIP Asterisk developers start from $25/hr for mid-senior roles and $38/hr for senior engineers. Full-time monthly retainer (160 hrs) starts at approximately $4,000/month — 50–65% less than equivalent US/UK Asterisk consultants or agencies.

Q:Do CelloIP Asterisk developers know Asterisk 20 and 21 specifically?

Yes. CelloIP's bench includes engineers actively working on Asterisk 20 LTS and 21. They are experienced with PJSIP endpoint model, ARI Stasis applications, and the removal of chan_sip in Asterisk 21.

Q:Can CelloIP Asterisk developers integrate with Salesforce or HubSpot?

Yes. CelloIP has delivered Salesforce CTI integrations using AMI events + Salesforce Streaming API, HubSpot click-to-call via ARI, and Zoho CRM screen-pop using FastAGI Python. CRM integration is a standard Asterisk developer capability.

Q:Can I hire an Asterisk developer for just the PJSIP migration project?

Yes. CelloIP offers project-based engagements for defined scopes like chan_sip to PJSIP migration. Typical scope: endpoint audit, pjsip.conf generation, trunk reconfiguration, TLS/SRTP upgrade, and regression testing. Fixed price quoted per audit findings.

Q:What is the difference between AGI and ARI for Asterisk development?

AGI (Asterisk Gateway Interface) is synchronous: the dialplan passes control to an external script for call logic, which executes commands and returns control. ARI (Asterisk REST Interface) is asynchronous: an external WebSocket/REST application drives call flow entirely — better for complex, stateful applications like call centres and conference platforms. CelloIP developers are proficient in both.

Q:Can CelloIP build a conversational AI IVR on Asterisk?

Yes. CelloIP has built GPT-4 powered IVR systems using Asterisk FastAGI: audio stream → Whisper ASR → GPT-4 intent → ElevenLabs TTS playback → Asterisk routing action. Typical end-to-end latency under 800ms with optimised caching.

Q:What hourly rate should I expect for an Asterisk developer in 2026?

Asterisk developer rates: $100–$180/hr in the US/UK, $25–$55/hr in India for equivalent seniority. CelloIP's Asterisk engineers start at $25/hr (mid-level) up to $55/hr (senior architects) — full-time staff with deep AGI/ARI/PJSIP production experience.

Q:What skills should an Asterisk developer have?

A strong Asterisk developer knows: AGI/FastAGI scripting, ARI (REST + WebSocket) for async call control, AMI, PJSIP configuration and chan_sip migration, dialplan logic, app_queue for call centers, AudioSocket for AI integration, and HA clustering with Kamailio/OpenSIPS. Ask them to explain AGI vs ARI to test depth.

Q:How quickly can an Asterisk developer start?

CelloIP Asterisk developers onboard in 48 hours — NDA Day 1, access provisioned within hours, contributing to your dialplan and AGI/ARI code by the end of the first day.