Huawei eSpace 6805 Administrator's Manual page 12

eSpace 6805 IP Phone
Administrator Guide
Parameter
NAT Traversal
Issue 01 (2014-01-06) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
3 Configuration and Loading Files
Description
Displays whether to enable NAT traversal
and if enabled, in which mode NAT
traversal is implemented.
 No: NAT traversal is disabled. Choose
this option when the SIP server and the
eSpace 6805 belong to the same private
network or when NAT traversal is
performed by the SIP server.
 STUN: The eSpace 6805 runs based on
the STUN client specifications. In this
mode, the built-in STUN client of the
eSpace 6805 communicates with the
specified STUN server to detect whether
Firewall/NAT exists and if exists, which
type the Firewall/NAT is. If the NAT
type detected is Full Cone, Restricted
Cone, or Port-Restricted Con, the eSpace
6805 tries using public IP addresses and
ports in all its SIP and SDP information.
 Keep alive: The eSpace 6805 sends
empty SDP packets (packets without
payload) to the SIP server at intervals
(about 20s) to keep alive the port that
accesses NAT.
 UPnP: Before using the SIP or RTP port,
the eSpace 6805 automatically sends a
mapping request to the built-in UPNP
server of the NAT and applies the
obtained port to the SIP or RTP
information for NAT traversal.

Auto: The eSpace 6805 automatically
selects the NAT traversal solution
according to the detected upper-layer
NAT type.
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