Are you positive you're using your SIP username and your SIP password? Look under "Extensions" on the Callcentric web portal.
I find the following at Callcentric portal: extension
EXTENSIONS
Help [113] Help
1777xxxxxxxxxx Ext: 100 Default extension YOUR PHONE IS NOT REGISTERED Modify
Caller ID: 17772192364Block Caller ID: OffDo not disturb: OffAnonymous call rejection: OffCall waiting: On
1777xxxxxxxxxx101 Ext: 101 Pham Hung YOUR PHONE IS NOT REGISTERED Modify
Caller ID: 17772192364Block Caller ID: OffDo not disturb: OffAnonymous call rejection: OffCall waiting: On
1777xxxxxxxxxx102 Ext: 102 Jtpham YOUR PHONE IS NOT REGISTERED Modify
What change do I have to make on these.
I'm not sure I set it up correctly. There is no auto setup on Callcentric site