A: Please check your PC connects the R7121-L1/R7141-L1/R7111-L1 Lan port or PC and
R7121-L1/R7141-L1/R7111-L1 with the same Subnet. If you PC aren’t at the same Subnet, you can’t Login
the R7141-L1 Web interface. Else you let your R7121-L1/R7141-L1/R7111-L1 on Public Internet (Public IP
address).
7. Why does the one way talk happen?
A: Generally, one way talk happen when use the different codec between VoIP devices make call. Please
check and setting the same codec, most one way talk will be solved.
8. Why can I call out when the R7121-L1/R7141-L1/R7111-L1 under the NAT?
A: Most VoIP products have problem in NAT Pass through. By SIP, there are many NAT Pass through
Function can solve 80% NAT Problem. You can choose STUN/Outbound Proxy/ Symmetric RTP to Pass
through NAT, you don’t set any other setting (DMZ/Virtual Server) by router side. If you use
STUN/Outbound Proxy, you must have a STUN/Outbound Proxy Server to support. If they can’t pass NAT,
please open the DMZ/Virtual Server by Router/NAT/Firewall.
B - Scenario Application Samples
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