SERVICE

FreeSWITCH Development

Production FreeSWITCH systems: SIP, media, ESL, multi-tenant routing and the application layer that actually owns the call.

mod_sofiaESL & XMLWebRTCAI mediaHA / SBCMulti-tenant

Most “FreeSWITCH jobs” fail in production for the same reason: someone installed a box, imported a dialplan, and hoped Sofia would forgive NAT, codecs and carrier quirks. UnifiedPBX.in treats FreeSWITCH as a media + signaling engine inside a larger platform — SBC, APIs, admin UI, recording, billing and (when needed) an AI voice path.

This service is for operators, CCaaS founders and enterprises that need a FreeSWITCH consultant who can read a SIP trace, write ESL, and still design the SaaS side. Work is delivered remotely from Delhi for clients worldwide.

Reference architecture

The diagram is the default production shape. Your carriers, cloud and product UI change the boxes; the boundaries stay the same.

FreeSWITCH production plane
PSTN / SIP trunksDID, failover, CLI
WebRTC / SIP phonesBrowser, desk, mobile
SBC / Kamailio / OpenSIPSAuth, topology hiding, CPS
FreeSWITCH clusterDialplan · Sofia · conference · record
ESL / XML / Lua / PythonCall control & events
Media bridgeRTP ↔ AI / recording
App / CCaaS / CRM APIsTenants, agents, billing
Call control stays in FreeSWITCH. Product logic and AI stay outside the SIP stack.

What this FreeSWITCH service actually covers

SIP routing & trunks

Inbound DID maps, outbound gateways, failover, CLI/privacy, 4xx/5xx handling and carrier-specific SIP quirks.

Dialplan & IVR

XML/Lua dialplans, menus, queues, intercept, attended transfer, and clean handoff to humans or AI.

ESL application layer

Outbound/inbound ESL, event sockets, originate, park, barge and custom call-control services.

WebRTC on FreeSWITCH

verto/SIP.js, ICE/TURN, codec mismatch, one-way audio and browser softphone integration.

AI & media

Unicast RTP forks, stereo record, barge-in friendly bridging to STT/TTS without giving the model SIP.

Operations

sofia status, logs, core dumps, CPS limits, HA, Docker/K8s placement and monitoring that telecom people trust.

Who searches for this — and who should hire it

Search demand clusters around FreeSWITCH developer, FreeSWITCH consultant, FusionPBX expert, and custom cloud PBX. The buyers who convert are not looking for a GUI tweak. They have one-way audio, a tenant leak, a campaign that drops after 30 minutes, or a product that must expose APIs on top of the switch.

  • CCaaS / UCaaS startups replacing a brittle hosted PBX
  • Enterprises leaving hardware IPPBX or CUCM-style lock-in
  • AI voice vendors who bought a SIP trunk and discovered media is the product
  • IT teams who inherited a FreeSWITCH box with no diagrams

Feasibility before you write a purchase order

A useful first week answers: which process owns the call, where RTP hairpins, how tenants are keyed, and what happens when the AI or CRM is down. If those four answers are missing, implementation is guesswork. That discovery is the engagement, not a sales call.

Read the architecture article FreeSWITCH vs Asterisk if you are still choosing an engine.

FAQ

Questions buyers and AI search engines ask

Choose FreeSWITCH when you need high concurrent media, conference, WebRTC, programmable ESL, or a multi-tenant core that will sit under a SaaS product. Asterisk remains excellent for classic PBX, AGI/ARI apps and many contact-center stacks. The decision is architectural, not brand preference.

Yes. Typical takeovers start with SIP traces, sofia status, codec/NAT paths, dialplan ownership and whether ESL/Lua/Python already exists. Then we stabilize audio and routing before adding features.

Yes. FreeSWITCH stays the call-control plane. A media bridge streams RTP to STT/TTS and an agent runtime. The LLM never owns SIP. Transfer, record, DNC and emergency stay in the dialplan.

Yes, but tenant isolation must be designed: domains, ACL, DID ownership, recording paths, rate limits and a control-plane API. FusionPBX can be the admin UI; a custom SaaS portal is often the product surface.

Need this built?

Send the current architecture, call volume, carriers and the workflow you need to automate or productize. Discovery can start from a broken PBX or a blank product brief.

Discuss Your Project hello@unifiedpbx.in
Related
FusionPBX customization →AI voice on SIP →Cloud PBX architecture →FreeSWITCH vs Asterisk →

Architecture first. Then production.

A practical technical discussion focused on SIP, media, tenants, AI and the delivery path — not a generic sales deck.

Send the brief