Huawei eSpace 6805 Administrator's Manual page 23

Huawei IP Phone eSpace
6805&6810&6830&6850&6870
Administrator Guide
Field
Failure Retry Wait
Time
SIP T1 Timeout
SIP T2 Interval
SIP Transport
Check Domain
Certificates
Remove OBP from
Route
Validate Incoming
Messages
Support SIP
Instance ID
NAT Traversal
Subscribe for MWI
SUBSCRIBE for
Registration
Issue 01 (2011-12-21)
Description
registration packet once the registration fails due to multiple possible
reasons.
The default value is 0.5.
The default value is 4.
Select the SIP transport either through UDP or TCP. The default
value is UDP.
Indicates whether to check the domain name certificate based on the
definition in RFC 5922.
The default value is No. If Outbound Proxy is selected, the routing
information is added as the first field to an SIP message sent by a
phone by default. If Remove OBP from Route is set to Yes, the
routing information is deleted from an SIP message sent by a phone.
This parameter verifies the received SIP information.
Indicates whether to add an instance ID to a REGISTER message
initiated by a phone. The default value is Yes.
This parameter activates the NAT traversal mechanism.
 The default value is No, indicating that the NAT traversal is not
used. The mode is used in the situation that the SIP server and the
terminal are on the same private network, or the NAT traversal of
the RTP media stream is implemented by the SIP server.

When you enable the parameter by selecting STUN, and when a
STUN server is also specified, the phone works according to the
STUN client specifications. In this mode, the embedded STUN
client detects if and what type of NAT/Firewall configuration is
used. If the detected NAT type is Full Cone, Restricted Cone, or
Port-Restricted Cone, the phone uses its mapped public IP address
and port number in all SIP and SDP messages.
 If you select Keep-alive, the eSpace 6870 IP phone periodically
(every 20 seconds) sends a blank UDP packet (with no payload
data) to the SIP server to keep hole on the NAT open.

If the parameter is set to UPnP, eSpace 6870 sends the mapping
request to the built-in UpNP server of the NAT before using the
SIP or RTP port. In addition, eSpace 6870 maps the result port in
the SIP or RTP message to implement the NAT traversal.
 If the parameter is set to Auto, eSpace 6870 sets the NAT
solution according to the detected upper-level NAT type.
If the outbound proxy server is used, this parameter must be set to
No.
The default value is No. If the parameter is set to Yes, a
SUBSCRIBE for message waiting indication is sent periodically.
The default value is No. If this parameter is set to Yes, a phone sends
a SUBSCRIBE message when sending a REGISTER message.
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2 Configuration and Loading Files
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