
Siperb Mobile Softphone
7.9#1 in softphone softwareFrom £2 a monthFree planAndroidiOSWebAPI
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It suits end users who need a mobile extension connected to an existing PBX or SIP system, as well as IT administrators supporting those setups. Its cross-platform account may suit users who want shared contacts, settings, and call history across devices.
You want what its maker publishes above — check its page for the details.