If your SIP provider supports SIP SIMPLE, you can send and receive messages with these apps. Select Settings > Accounts > a desired account > Advanced Settings, then enable the SIMPLE option.
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On the Main screen:
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Android devices - Select
> Settings > Accounts. -
iOS devices - Select
> SIP Accounts or Accounts.
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On the Accounts screen, select the desired SIP account.
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Select Advanced settings.
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Enable SIMPLE under the Messaging section.
- Select
or Done.
The following video demonstrates the steps to enable SIMPLE messaging on an Android device.