VoIP SIP SDK for iOS
Maс OS
Development environments
VOIP SIP SDK for iPhone on objective-C (Xcode);
VOIP SIP SDK for iPhone on Swift.
Features
CallKit support
PushKit support
Conference call
stable background mode until iOS 16, PushKit+CallKit support for operation in background on newer iOS versions;
ability to use SDK as dynamic or static library
MWI support
SIP/RTP
STUN, NAT64
IPv4/IPv6 support
most SIP servers support
ICE
TURN
UDP/TCP support
seamless network change
voice and video calls
transfer calls
calls recording
ability to route audio to Bluetooth headset
IM
secure connection via SRTP+TLS, ZRTP
changing camera orientation
switching between multiple cameras
Available codecs
H.263
H.263+
H.264
VP8
G.711-ALaw
G.711-muLaw
G.729
OPUS
Speex
Theora
GSM
SILK
G722.1
G723.1.
iOS versions
VoIP SIP SDK for iOS 18
VoIP SIP SDK for iOS 17
VoIP SIP SDK for iOS 16
VoIP SIP SDK for iOS 15
VoIP SIP SDK for iOS 14
VoIP SIP SDK for iOS 13
VoIP SIP SDK for iOS 12
Updates
Update VOIP SIP SDK for iOS
July 28, 2025
iOS changelog: Minor fixes and improvements to the version released a month ago Partial rebuild using the latest Xcode version for improved compatibility
Learn moreUpdate VOIP SIP SDK for iOS
June 3, 2025
iOS changelog: – updated OpenSSL to 1.1.1w – updated libSRTP to 2.5.0 – added support for TLS 1.3, disabled by default – added option to change secure transport encryption type via socketEncryptionOptions option – added option in method updateCall to use SIP UPDATE instead of re-INVITE – added Objective-C sample with background method execution using GDC – Added script to generate dynamic SDK XCFramework
Learn moreUpdate VOIP SIP SDK for iOS
November 6, 2024
iOS changelog: – BREAKING CHANGE: fixed crash on iOS 16+ caused by socket background marking deprecated in iOS 10, this feature was used to operate while in background so that current SDK is unable to work in background on iOS 16+ without using …
Learn more
ABTO Software VoIP SIP SDK for iPhone and iPad will help you to quickly build a custom softphone app for iOS.