I have added an "Internet Call" value to certain contacts containing the SIP URI (user@domain) of other contacts on my service.
However, in Zoiper's contact list it only shows the contact's numbers and not the Internet Call value and so I am unable to make a SIP call from the contacts list in Zoiper.
Entering the same value manually into the Zoiper dialer works OK to start a call.
How does Zoiper recognise SIP URIs in contacts?
This is on Nexus 5 (Android 6.0.1) and Nexus 7 (also Android 6.0.1) with Zoiper 1.33 for Android