What are some alternatives?
When comparing Eir SIP Voice and Phonebooth, you can also consider the following products
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
MightyCall - Virtual phone system that lets you run your business from anywhere.
VoIP.ms - VoIP.ms is a VoIP origination and termination tool.
VirtualPBX - VirtualPBX provides hosted VoIP PBX phone services that give small and medium growing businesses a professional, fully automated call answering and routing solution
Loop Communications - Loop Communications provides hosted VoIP business phone systems to small businesses and mid-sized companies.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies