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SCOOPY+ S - User Manual
123
Standard NAT router
Situation: codec A behind a NAT router with no specific programming (a codec accessing Internet via a
mobile network is almost always in such situation).
Besides, we assume that the other codec (B) is accessible with a public address.
Once codec A is configured for using a STUN server:
codec A can initiate a connection to (call) codec B
codec B cannot call codec A
Advantages
Drawbacks
Configuration is relatively simple
B cannot call A
No change is needed on the router
Several codecs can be set behind the NAT
router
Method suitable for mobile network access1
NAT router with DMZ
Situation: codec A behind a NAT router and placed in "DMZ".
We also assume that the other codec (B) is accessible with a public address.
Once codec A is configured for using a STUN server:
codec A can initiate a connection to (call) codec B
codec B can call codec A, using the public address of the NAT router
Advantages
Drawbacks
Each codec can set up a session
Need to configure the router
A is nearly equivalent to a codec with a
direct public access
Only one codec can be set up in this way on a LAN
A is exposed to external attacks
The DMZ may be already reserved for other network
equipment
Method not possible for a mobile network access
NAT router with port forwarding
Situation: codec A behind a NAT router and configuration of the router to forward to A the necessary
ports.
We also assume that the other codec (B) is accessible with a public address.
Port forwarding to be set on the router2:
UDP 5060 (= SIP port)
UDP 5004 (RTP port) and 5005 (RTCP port)
1 Except with symmetric NAT, which is often met for mobile network access
2 If needed you can change these numbers on the SCOOPY+ S
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