Natterbox Alternatives [Page 2]

SIP proxy server implementation compliant to RFC3261, written in C++11 started in 2011.

Simplify your communication with Acefone hosted phone system and cloud communication services that come with powerful features.

paid Free Trial

AirDroid Business, an enterprise-grade MDM solution, is designed to enable businesses mobility and productivity through remote access and control, device provisioning, policy application and management, kiosk mode, and geofencing.

Try for free paid Free Trial $12.0 / Annually

VitalPBX is a full-feature PBX (phone system) based on Linux and Asterisk.

SIP Softswitch for Windows with PBX, billing and business features

FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).

Open Source

Vodia supports multi-tenancy operation which allows users to manage several organizations through a single instance of the software.

freemium $173.0 / Annually (Vodia 10 Standard extensions)

Your Open Source Solution For Unified Comunnications And More…

PBX in a Flash is a PBX system based on Asterisk, FreePBX and CentOS, coming as an ISO download.

Cloud Telephony delivers automated telephone applications to any phone, any place, anytime.

RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies

Open Source freemium $19.99 / Monthly (All-in-One Phone, Team Messaging, and Video Conferencing.)

Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs

Zendesk is a beautiful, lightweight help-desk solution.

Visit website

Cloud phone system & contact center software & services