https://voipsipsdk.com/
ABTO Software's VoIP SIP softphone SDK (home page) - ABTO Software's VoIP SIP SDK
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https://www.telecompaper.com/news/counterpath-intros-softphone-sdk-for-desktop-tablet-mobile--985646
CounterPath intros Softphone SDK for desktop, tablet, mobile - Telecompaper
Mobile VoIP software provider CounterPath has introduced a new Softphone software development kit (SDK), designed to enable enterprises, operators and services...
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