OK, that is good， on advanced menu line2, do following

set
Proxy: sip.rynga.com
Use Outbound Proxy: no
Outbound Proxy: sip.rynga.com
Use OB Proxy In Dialog: yes
Register: yes
Make Call Without Reg: yes
Register Expires: 3600
Ans Call Without Reg: no
Use DNS SRV: yes
DNS SRV Auto Prefix: no


Subscriber Information
Display Name: your english name
User ID: your rynga username
Password: your rynga password
Use Auth ID: no