VoIP Phones - SessionTalk SIP
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SessionTalk SIP is a free software phone compatible with IOS, Android and Windows desktop.
This is not recommended as there are re-registration problems
The app does seem to have a problem in that it does not re-register if the App is in the background (ie not running on the screen). This means that it drops the connection to our servers and calls will not be received.
This is covered in a blog post on SessionTalk's website which talks about Asterisk, but the problem is similar with A&A's VoIP platform : https://sessiontalk.io/blog/sip-push-notifications-asterisk-freeswitch