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RV042 VoIP-phone reports "Registration failed"

This is a continuation of a discussion that I erroneously marked "answered".

The title was "RV042 protocol binding for SIP and RTP (VoIP)"

I would like to provide a link to it here but I don't know how.

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RV042 VoIP-phone reports "Registration failed"

Problem is solved. Reason was that Network Service Detection was enabled and the Default Gateway did not respond to ping requests which resulted in a WAN failure condition with the consequence of protocol bindings failing over to the working WAN which is inappropriate for the IP-phone registering with the IP telephony provider.

Best regards, Felix