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Head-to-head · IP PBX Software

Avaya IP Office vs 4PSA VoipNow

  • Updated Oct 2026
  • Both researched from official sources
  • 2 checks side by side
Higher score Avaya IP Office #2 in IP PBX Software 9.0/10 Pricing on request ✓ 1 of 3 features Visit Avaya
4PSA VoipNow #8 in IP PBX Software 7.9/10 Free plan · 30-day trial Free planFree trial✓ 0 of 3 features Visit 4PSA

Avaya IP Office leads on 0 checks, 4PSA VoipNow on 0, and 2 are even. Who comes out ahead on the 2 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreAvaya IP Office · 9.0/10
  • Free planonly 4PSA VoipNow
  • Free trialonly 4PSA VoipNow
  • Most featuresAvaya IP Office · 1 of 3

Avaya IP Office scores higher on our rubric for ip pbx software: 9.0 against 7.9 out of 10; our editors rank them #2 and #8.

Avaya IP Office is the better fit for organizations standardizing on an established on-prem PBX. 4PSA VoipNow is the better fit for service providers needing a multitenant PBX.

  • Avaya IP Office fits best

    Organizations standardizing on an established on-prem PBX

  • 4PSA VoipNow fits best

    Service providers needing a multitenant PBX

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Avaya IP Office 9.0/10 Visit ↗ 4PSA VoipNow 7.9/10 Visit ↗
At a glance
Editor score 9.0 7.9
Ranking #2 in IP PBX Software #8 in IP PBX Software
Best for Organizations standardizing on an established on-prem PBX Service providers needing a multitenant PBX
Pricing model Paid Free plan + paid
Starting price Pricing on request —
Free plan Not checked yet ✓ (best)
Free trial — 30 days
Deployment Self-hosted, Desktop, Mobile Cloud, Self-hosted
Platforms Windows, macOS, iOS, Android Web
Support Tickets, Docs Community, Docs
Integrations 9 integrations 5 integrations
Built for Small business, Mid-market, Enterprise Mid-market, Enterprise
Features Avaya IP Office 1/3 · 4PSA VoipNow 0/3
Web management Not checked yet Not checked yet
Call recording ✓ (best) Not checked yet
High availability Not checked yet Not checked yet
Specs
Concurrent call limit Not checked yet Not checked yet
Deployment options Not checked yet Not checked yet
Supported platforms Not checked yet Not checked yet
Our review
Pros
  • Combines TDM and IP telephony with trunk support.
  • Includes auto attendants, call routing, recording, and conferencing.
  • Workplace Client supports desktop and mobile calling, messaging, and presence.
  • Advanced call routing, fallback, IVR and auto-attendant menus
  • Multitenant administration with role-based permissions
  • Cloud and self-hosted deployment options
Cons
  • Purchasing is routed through sales or partners rather than public pricing.
  • Instant messaging requires one-X Portal or Avaya cloud services.
  • Features vary by edition, deployment, license, and territory.
  • The perpetual-license option lists 10 extensions
  • That perpetual-license option includes one year of software updates
  • Listed support channels are community and documentation
Our verdict

Avaya IP Office brings on-premises unified communications and telephony together for small, medium-sized, and larger organizations. Its hybrid PBX supports both TDM and IP telephony, while voicemail, call management, conferencing,…

Read the review →

Service providers and organizations looking for a multitenant PBX can use 4PSA VoipNow for enterprise telephony and unified communications. It combines call routing, SIP trunking, IVR, voicemail, recording, queues and contact-center tools…

Read the review →
  1. Avaya IP OfficeIP PBX Software 9.0Pricing on request
  2. 4PSA VoipNowIP PBX Software 7.9Free plan · 30-day trial

Strengths and trade-offs

  • Avaya IP Office — where it wins

    • Combines TDM and IP telephony with trunk support.
    • Includes auto attendants, call routing, recording, and conferencing.
    • Workplace Client supports desktop and mobile calling, messaging, and presence.

    Where it doesn't

    • Purchasing is routed through sales or partners rather than public pricing.
    • Instant messaging requires one-X Portal or Avaya cloud services.
    • Features vary by edition, deployment, license, and territory.

  • 4PSA VoipNow — where it wins

    • Advanced call routing, fallback, IVR and auto-attendant menus
    • Multitenant administration with role-based permissions
    • Cloud and self-hosted deployment options

    Where it doesn't

    • The perpetual-license option lists 10 extensions
    • That perpetual-license option includes one year of software updates
    • Listed support channels are community and documentation
  • Avaya IP Office9.0/10 · Pricing on request

    A hybrid on-prem PBX with broad calling and collaboration features for Avaya-oriented organizations.

    Visit AvayaFull verdict →
  • 4PSA VoipNow7.9/10 · Free plan · 30-day trial

    A multitenant PBX for providers that need routing, SIP trunking and cloud or self-hosted deployment.

    Visit 4PSAFull verdict →

More comparisons

All IP PBX software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update