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SCOOPY+ S - User Manual
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8.3.3. Summary and reminder of essential rules
The table below sums up the situations where a link can be set up (not using a SIP proxy server) and
reminds the needed specific settings:
Codec A
access
Possible
calls
Codec B
access
Notes
1
LAN
LAN
(same)
2
Private WAN
Private WAN
3
Internet direct
Internet direct
4
NAT
Internet direct
STUN needed for A
5
NAT + DMZ
Internet direct
STUN needed for A
6
NAT + port
forwarding
Internet direct
STUN needed for A
UDP ports 5004, 5005, 5060
7
NAT
NAT + DMZ
STUN needed for A and B
8
NAT + DMZ
NAT + DMZ
STUN needed for A and B
9
NAT + port
forwarding
NAT + DMZ
STUN needed for A and B
UDP ports 5004, 5005, 5060
10
NAT
NAT + forwarding
STUN needed for A and B
11
NAT + DMZ
NAT + forwarding
STUN needed for A and B
12
NAT + port
forwarding
NAT + forwarding
STUN needed for A and B
UDP ports 5004, 5005, 5060
Basic rule: Codec behind a NAT router => use a STUN server.
This allows the codec to set up outgoing calls. This is not sufficient to be accessible to connection
requests from the outside.
Mobile network access without SIP server or VPN => use a STUN server
NAT + DMZ or NAT + forwarding => incoming calls are possible.
Incoming calls are not possible behind a NAT router without either such change or a SIP proxy.
SIP server => maximum versatility, at the expense of some initial effort (for installation)
Reminder: the SIP protocol does not impose the use of a SIP server. Codecs can set up point-to-point
links using this protocol in the above described conditions. When no SIP registrar is involved, the
identifiers are simply the IP addresses of the codecs.
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