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CALLA sip phone app for iPhone and iPad

4.9 ( 5879 ratings )

Business Productivity
Developer: Gong Liu

Free

Current version: 2.0, last update: 8 years ago
First release : 16 Nov 2012
App size: 5.62 Mb

CALLA is a sip softphone supporting TCP/UDP/TLS/SRTP/TSM protocols.