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Elastix vs Sideline

Professional comparison and analysis to help you choose the right software solution for your needs.

Elastix icon
Elastix
Sideline icon
Sideline

Elastix vs Sideline: The Verdict

⚡ Summary:

Elastix: Elastix is an open source unified communications server software that combines IP PBX, email, IM, faxing, and collaboration features. It is built on top of free open source software like Asterisk, HylaFAX, Openfire, and Postfix.

Sideline: Sideline is a phone app that provides users with a second phone number to keep their personal and work calls separate. It has features like call forwarding, voicemail transcripts, blocking contacts and more.

Both tools serve their respective audiences. Compare the features, pricing, and user ratings above to determine which best fits your needs.

Last updated: May 2026 · Comparison by Sugggest Editorial Team

Feature Elastix Sideline
Sugggest Score — —
Category Network & Admin Social & Communications
Pricing Open Source Subscription

Product Overview

Elastix
Elastix

Description: Elastix is an open source unified communications server software that combines IP PBX, email, IM, faxing, and collaboration features. It is built on top of free open source software like Asterisk, HylaFAX, Openfire, and Postfix.

Type: software

Pricing: Open Source

Sideline
Sideline

Description: Sideline is a phone app that provides users with a second phone number to keep their personal and work calls separate. It has features like call forwarding, voicemail transcripts, blocking contacts and more.

Type: software

Pricing: Subscription

Key Features Comparison

Elastix
Elastix Features
  • IP PBX for VoIP calls
  • Voicemail
  • Call conferencing
  • Call recording
  • Fax server
  • Instant messaging
  • Presence management
  • Email server
  • CRM integration
Sideline
Sideline Features
  • Second phone number
  • Call forwarding
  • Voicemail transcripts
  • Blocking contacts
  • Conference calling
  • Call recording
  • Visual voicemail
  • Do not disturb mode

Pros & Cons Analysis

Elastix
Elastix
Pros
  • Open source and free
  • Built on proven open source components like Asterisk
  • Supports a wide range of telephony features
  • Easy to install and manage
  • Scalable for small to large deployments
Cons
  • Limited official support options
  • Requires technical expertise to setup and manage
  • Not as feature rich as some commercial UC solutions
  • Fragmented ecosystem of addons and integrations
Sideline
Sideline
Pros
  • Keeps personal and work calls separate
  • Easy to set up and use
  • Affordable pricing
  • Good call quality
  • Useful features like voicemail transcripts
Cons
  • Mobile app only, no desktop app
  • Number porting can take time
  • Some features require premium plan
  • Limited international calling

Pricing Comparison

Elastix
Elastix
  • Open Source
Sideline
Sideline
  • Subscription

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Learn More About Each Product

Elastix
Elastix
Reviews, pricing & alternatives →
Sideline
Sideline
Reviews, pricing & alternatives →

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