STEP 4:
Repeat the same configuration steps on the VIP-280, and check the machine registration
status, make sure the registrations are completed.
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Test the scenario:
To verify the VoIP communication, you may make calls from SIP client (VIP-280) 280 to the SIP client
(VIP-320) 320 or reversely make calls from SIP client (VIP-320) 320 to the SIP client (VIP-280) 280
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