There are two VOIP protocols of this ONU, i.e. SIP or H.248,
The default is SIP, if you need H.248, you can switch.
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The following adapter is the original one come together with the ONU; it is the default adapter when we deliver:
You can also select the following adapters and inform us when you order:
Following is the package:
Please contact us to confirm everything before you pay. Thank you.