Grandstream Networks GXP17 Series Administration Guide

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GXP21XX Administration Guide
 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
UDP
TCP
TLS/TCP
Transport Only
Accept incoming
request using UDP.
All outgoing request
will go out using UDP.
Accept incoming
request using TCP.
All outgoing request will
go out using TCP.
Accept incoming
request using TLS/TCP.
All outgoing request will
go out using TLS/TCP.
Dual
Accept incoming
request using both
TCP and UDP.
All outgoing request
will go out using UDP.
Accept incoming
request using both TCP
and UDP.
All outgoing request will
go out using TCP.
-
Dual (Secured)
Accept incoming
request using both
TLS/TCP and UDP.
All outgoing request
will go out using UDP.
-
Accept incoming
request using both
TLS/TCP and UDP.
All outgoing request will
go out using TLS/TCP.
Dual (BLF
Enforced)
Accept incoming
request using both
TCP and UDP.
All outgoing request
will go out using UDP
except for the
BLF/Eventlist
subscription the phone
will add Transport=TCP
into the contact header.
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.
-
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

Grandstream Networks GXP17 Series Specifications

General

Brand	Grandstream Networks
Model	GXP17 Series
Category	IP Phone
Language	English