Service

Business VoIP Solutions

FreePBX, Asterisk, 3CX, and SIP trunking — number porting, IVR, queues, softphones and desk phones, QoS, and staged cutover with rollback.

  • FreePBX
  • Asterisk
  • 3CX
  • SIP
  • Kamailio
  • Yealink
  • Poly
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Why Varnox

What you can expect

  • 01

    Platform chosen for your scale, self-host vs cloud preference, and licensing budget

  • 02

    Pilot extensions and trunk testing before full cutover; legacy lines kept until you are confident

  • 03

    Call-flow diagrams, extension directory, and admin guide for everyday changes

Full scope

Everything in this lane

High-level checklist of what we cover — scoped and priced per project, not all at once unless you ask.

Platforms & trunking

  • FreePBX, Asterisk, and 3CX — cloud-hosted or on-prem per your requirements
  • SIP trunk selection, registration, failover trunk, and outbound caller ID
  • Number porting coordination, LOA paperwork, and test DID before cutover
  • Kamailio or OpenSIPS for routing at scale when architecture requires it
  • International and toll-free number strategy where carriers support it

Call flows & features

  • IVR menus, time conditions, and holiday schedules
  • Ring groups, hunt groups, call queues, and agent login/logout
  • Voicemail, voicemail-to-email, and custom prompts (recorded or TTS)
  • Conference rooms, call parking, pickup groups, and intercom/paging where needed
  • After-hours routing to mobile, answering service, or voicemail

Endpoints & users

  • Desk phones (Yealink, Poly, etc.) provisioning and template configs
  • Softphones: 3CX app, Zoiper, Linphone, and mobile clients
  • Hot-desking, shared reception, and remote worker extensions
  • Headset compatibility and sidecar layouts for reception-heavy roles

Quality, security & compliance

  • Codec selection (G.711, Opus) and jitter buffer tuning
  • QoS/DSCP on business routers; bandwidth planning per site
  • NAT traversal, STUN, and firewall pinholes documented
  • SIP TLS/SRTP where provider and endpoints support it
  • Call recording setup with retention and consent notes for your jurisdiction

Integrations & handover

  • CRM click-to-dial or basic pop-up integrations when platforms allow
  • Microsoft Teams or legacy PSTN coexistence planning during migration
  • Admin training and written guide: add extension, change hours, update IVR
  • Monitoring trunk health and alerting before users notice dropped calls

Delivery

How we deliver it

Clear communication, documented changes, and pragmatic defaults — so you are never guessing what happens next.

  • Phone system changes fail when porting, firewall, and user training are afterthoughts. We stage pilots, test under real traffic, and keep rollback paths until you sign off.

  • You should manage everyday tasks — new extension, holiday hours — without opening a support ticket for each change.

FAQ

Common questions

About Business VoIP — ask us anything on the contact form if you do not see your scenario.

Most asked

FreePBX, Asterisk, and 3CX primarily, plus Kamailio for SIP routing at scale. Choice depends on self-host vs cloud, licensing, and extension count.
Usually yes through your carrier or SIP trunk provider, with LOA coordination and testing before cutover.
Not necessarily — many teams start with softphones. Compatible desk phones are recommended when hardware makes sense, without overselling features.
Codec tuning, jitter buffers, and router QoS/DSCP are in scope. Home broadband limits are stated upfront; trunk monitoring helps catch provider-side issues early.
Yes — IVR, ring groups, call queues, voicemail-to-email, time conditions, and after-hours routing, all tested before full cutover.

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