WestFax VS Star2Star

RingCentral Fax - RingCentral Fax is an online fax solution that enables companies to avoid the bulkiness of paperwork and maintenance costs of fax machines and charges of phone lines.

mFax - mFax is a cloud-based fax solution for sending and receiving faxes from any device.

Hellofax - Easy. Reliable. Online faxing. Send & receive faxes from anywhere.

XM Fax - XM Fax is a file exchange solution that provides companies and users with secure transmission of their highly sensitive documents, including contracts, financial statements, transcripts, legal notices, etc.

eFax - Over 11 million people use eFax every day for their fax communications.

OpenText RightFax Fax Server - Fax server software by OpenText provides a scalable solution that integrates with industry applications that power business processes.