Call2Call

Call2Call Softphone is a SIP-based softphone for iPhone that uses Wi-Fi or 4G/LTE connection to make and receive calls and instant messages.

In coordination with the PBX server, push notifications are supported, and calls and messages can be received even if it is forcibly terminated.

Simultaneous multiple calls can be supported by using the iPhone's existing contact list and intuitive interface for easy and efficient communication management. Call features include the ability to switch between two calls, merge and split calls, and perform attended and unattended call transfers. It also supports video conferencing that requires MCU support.

Incorporates advanced security settings for secure call signaling and audio encryption.

Supports H.264, VP8, VP9 codec video calls up to 1080P, and supports HD audio calls.
The provided codecs include: G.279, G.711a/u, Opus, AMR, AMR-WB, G.722.1, iLBC, GSM, SPEEX-WB, etc.