Grandstream GXV3140 User Manual Bedienungsanleitung Seite 49

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FIRMWARE VERSION 1.0.7.80 GXV3140 USER MANUAL Page 49 of 151
penetration in different network environments. If a symmetric NAT is
detected, STUN will not work and ONLY an Outbound Proxy will work.
Secondary Outbound Proxy
IP address or domain name of a backup Outbound Proxy.
DNS Mode
The default is set to A Record. If the user wishes to locate the server by DNS
SRV, the user may select SRV or NATPTR/SRV.
NAT Traversal
This setting decides whether the NAT traversal mechanism is activated. If it
is set to “Yes” and STUN server is configured, the GXV3140 will route
according the STUN server.
In this mode, the STUN client embedded in the phone will communicate with
the appointed STUN server to examine which type of Firewall/NAT setting is
employed. If the type of NAT detected is Full Cone, Restricted Cone or
Port-Restricted cone, the phone will try to use public IP addresses and port
in all the SIP and SDP messages.
If the “NAT Traversal(STUN)” is configured to be “No, but keep-alive”, the
phone will send an empty SDP packet (without payload data) to the SIP
server once in 20 seconds to keep the NAT port open. If an outbound proxy
server is used, please configure this to be “NO”.
Proxy Require
Notifies the SIP server that the unit is behind a NAT/Firewall.
Account/SIP Settings
SIP Registration
Selects whether or not the GXV3140 will send a SIP Register message to
the proxy; The default setting is YES.
Unregister On Reboot
If set to YES, the SIP user registration messages will be cleared on reboot.
The default setting is YES.
Register Expiration (m)
This defines the expiration time of the registration in minutes. The default
value is 50 minutes; the maximum value is 65535 minutes (approximately
45 days) and the minimum value is 5 minutes.
Wait Time Retry
Registration (s)
The wait time for registration retry if registration fails. The default is set to
20 Seconds.
Local SIP Port
The local SIP port for sending and receiving data. The default settings for
Account 1/2/3 are 5060/5062/5064.
Subscribe for MWI
Default is set to No. When selected, a SUBSCRIBE for Message Waiting
Indication will be sent out periodically.
Session Expiration (s)
Session Expiration is the time (in seconds) at which the session is
considered timed out if no successful session refresh transaction occurs
beforehand. The default value is 180 seconds.
MIN-SE (s)
The minimum session expiration (in seconds). The default value is 90
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