Blink vs Sip:phone

Blink is a real-time communications client that uses SIP to connect with service providers, Bonjour on a local network and SIP2SIP. A SIP account from a provider is required. Voice and video features include Opus audio, H.264, VP8 and VP9 video, acoustic echo cancellation and ZRTP media encryption. Messaging supports MSRP chat, OTR encryption, SIMPLE presence and XCAP server storage. File transfers use MSRP and TLS and include progress reports and delivery confirmation. Screen sharing can run with audio, while conferences can combine participant management, VoIP, messaging, presence, file transfers and screen sharing. Blink supports multiple SIP accounts, iCloud syncing between computers and built-in account sign-up through SIP2SIP. It also lists OpenPGP messaging support and says it does not collect end-user data. The free plan is free and lists Linux, Mac and Windows downloads. Available features may differ by operating system and version, and some conferencing functions require a conference server. Blink was founded in 2002.

Sip:phone extends Sipwise Class 5 Softswitch and CPBX services to Android and iOS as a mobile extension of an existing business phone system. It is intended as a white-label client for operators using Sipwise NGCP, who can customize its appearance and publish it under their own name in the Apple and Google app stores. Subscribers are managed on Sipwise C5 through interfaces such as its web interface or REST API; users can sign in with a username and password or scan a server-generated QR code. Calling includes audio and video, hold, two simultaneous calls, three-way conferences and blind or attended transfers. The app synchronizes phone contacts with Sipwise C5 subscribers and can show presence for favorite contacts. Administrators can configure whether a desk phone or mobile app rings first, or have either ring alone. Sip:phone requires an existing Sipwise server account and is not intended to support emergency calls. The App Store download is free, but commercial use requires a Sip:Phone App license; pricing is available from Sipwise Sales.