For connect IP phone via internet to OPTIROAM VoIP line, in your network internet must be support protocol sip and port 5060 and correct work of dns servers.
Download with iTunes or download it directly from the App Store on your mobile
click App Store or scan the QR code.
click Zoiper Softphone by Securax Ltd.
wait to complete installation
Connect VoIP line:
click SIP account
click and enter Accuont name, Domain, User name, Password, Auth Username, parameters of connections for IP phone
click Network Settings
move Enable STUN to ON, click and enter Server stun.optiroam.com click Save
click Audio codecs
a-law and u-law move to ON
status SIP line is registered
click Dialpad, enter caller number, click Call
Connect VoIP line via QR scanner:
click QR scanner
a viewfinder will appear, position the phone so that the black and white barcode fits between the lines.
Scan the code
fill in Nuber and Auth. Password from setting of VoIP Line
Parameters of connections for IP phone
click VoIP Lines