Sip.us has a rating of 5.0 stars from 1 review, indicating that most customers are generally satisfied with their purchases. Sip.us ranks 9th among Telemarketing sites.
The SIP.US Control Panel gives me all the tools I need to add, change and delete phone numbers. I can even order all the DIDs I need and set them up instantly. I love having access to these self-service tools, but I know the support team is also there if I need additional help.
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