Android
Some Android devices include a VoIP Client. VoIP works well with this VoIP client, but you need to make a small adjustment in the settings of your VoIP account.
Note: some manufacturers like Samsung have disabled the SIP capabilities in their custom ROM.
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Setting up the Android SIP client
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Outgoing call settings
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Custom ROMs and VoIP calling
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Mobile VoIP and quality
Related Pages
Android App
Android App