A good collection of cloud telephony service providers. They have the following things in common:
1.They provide a web based API using which users can call telephony applications like dial, get dtmf, record audio, play audio etc.
2.They take care of hardware setup and phone number provisioning so that you can worry only about your application.
3.Most of them have a pay for what you use policy so the initial setup costs are negligent. From here.
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