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Asterisk vs Sideline

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

Asterisk icon
Asterisk
Sideline icon
Sideline

Asterisk vs Sideline: The Verdict

⚡ Summary:

Asterisk: Asterisk is an open source communications software that allows you to build telephony applications and services. It supports voice over IP, video conferencing, voicemail, auto attendant, interactive voice response, and more. It can be used to build PBX systems, call center solutions, and other communications platforms.

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

Product Overview

Asterisk
Asterisk

Description: Asterisk is an open source communications software that allows you to build telephony applications and services. It supports voice over IP, video conferencing, voicemail, auto attendant, interactive voice response, and more. It can be used to build PBX systems, call center solutions, and other communications platforms.

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

Asterisk
Asterisk Features
  • PBX functionality
  • VoIP
  • Interactive voice response
  • Voicemail
  • Conference calling
  • Call routing
  • Call queuing
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

Asterisk
Asterisk
Pros
  • Open source and free
  • Highly customizable
  • Supports many protocols and codecs
  • Active development community
  • Integrates with many CRM and business software
Cons
  • Steep learning curve
  • Requires technical expertise to setup and manage
  • Limited official support
  • Fragmented documentation
  • Not as feature rich as proprietary PBX systems
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

Asterisk
Asterisk
  • Open Source
Sideline
Sideline
  • Subscription

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Learn More About Each Product

Asterisk
Asterisk
Reviews, pricing & alternatives →
Sideline
Sideline
Reviews, pricing & alternatives →

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