Please check the below instruction for Nimbuzz settings.
How to configure SIP settings on Nimbuzz:
Step 1:
1.       Open Nimbuzz
2.       Go to Options
3.       Go to  Settings
4.       Go to SIP providers
5.       Go to other
                        o Username
                         12345@sip.ymaxvoice.com
                        o Password
                          1234
                        o Proxy server
                         sip.ymaxvoice.com
6. Save
7. Ok
Note: here 12345 stand for pin user and 1234 for pin password,
Step 2:
1.       Go to Options
2.       Go to Settings
3.       Go to VoIP provider settings
o  Change VoIP Provider to SIP
   You can see three options
                         o   NimbuzzOut
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