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1. Start Zoiper application, then tap Settings | Accounts.


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2. Tap Yes to pass.


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3. Select Manual configuration.


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4. Select SIP account.


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5. Enter your account settings:


Account name: for example, MCN

Domain: SIP-domain address from registration email

User name: SIP ID

Password: SIP password

Auth Username: SIP ID


Tap Register to confirm changes.


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6. Tap Network Settings and set parameters:


rport: Don't use
Enable STUN: 
disable


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7. Turn on just a-law codec in section Audio codecs

Also, if you have G729 codec, you can turn it on too. 


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Your application is ready to use!  


Note


In section Settings | Incoming calls you can enable Force Background to receive calls, when application is in background mode.

This settings are available in Zoiper 3.4 for iPhone and iOS 8.