Nat Settings - Grandstream Networks GXP2130 Administration Manual


Functionality
Based on option "SIP Transport" and new option "SIP Listening Mode", GXP will decide which transport
protocol it should listening to from the incoming request.
SIP Transport
Mode
SIP
Listening Mode
Accept incoming
request using UDP.
Transport Only
All outgoing request
will go out using UDP.
Accept incoming
request using both
TCP and UDP.
Dual
All outgoing request
will go out using UDP.
Accept incoming
request using both
TLS/TCP and UDP.
Dual (Secured)
All outgoing request
will go out using UDP.
Accept incoming
request using both
TCP and UDP.
All outgoing request
will go out using UDP
Dual (BLF
except for the
Enforced)
BLF/Eventlist
subscription the phone
will add Transport=TCP
into the contact header.

NAT Settings

If the devices are kept within a private network behind a firewall, we recommend using STUN Server. The
following settings are useful in the STUN Server scenario:

STUN Server
UDP
Accept incoming
request using TCP.
All outgoing request will
go out using TCP.
Accept incoming
request using both TCP
and UDP.
All outgoing request will
go out using TCP.
-
Accept incoming
request using both TCP
and UDP.
All outgoing request will
go out using TCP
except for the
BLF/Eventlist
subscription the phone
will add Transport=TCP
into the contact header.
GXP21XX Administration Guide
TCP TLS/TCP
Accept incoming
request using TLS/TCP.
All outgoing request will
go out using TLS/TCP.
-
Accept incoming
request using both
TLS/TCP and UDP.
All outgoing request will
go out using TLS/TCP.
-
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