Go to phone settings

Go to sip settings

Select new sip profile

Profile name : Voiz Discount

Service profile : ietf

Default accesspoint : select 3g or wifi connection available

Public username : your username client@sip.voizdiscount.com

Use compression : no

Registration : alwayson

Use security : no

Proxy server

Proxy server address: sip.voizdiscount.com

Realm : sip.voizdiscount.com

Username : your username

Password : ur password

Allow looserouting : yes

Transport type : UDP

Port: 5060

Registrar server

Registrar server ip : sip.voizdiscount.com

Realm : sip.voizdiscount.com

Username : ur username

Password : password