From their site: LignUp Communications Web Services enable developers with no CTI or SIP experience to easily integrate real-time communications into applications, portals and processes. LignUp powered Solutions connect any two phones independent of the existing telecom infrastructure. Welcome to our BETA developer program. Register to access some of our call control and media control web services, leveraging the Level 3 Network. Upon registration, you will receive 800 free, one-minute (maximum time limited) calls.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.