User manual

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GSM VOIP Gateway Series
GSM VOIP Gateway USER MANUAL – Rev1 – Technical Support: [e-mail]
COPYRIGHT ©2011 WITURA CORPORATION SDN BHD
C. Trunk Agent
The trunk agent protocol is a firewall traversal technology developed by
Witura Corporation Sdn Bhd. It enables the products of Witura Corporation Sdn
Bhd to be applicable for most LANs. It involves the address, port, user name and
password.
The trunk agent protocol supports encryption on communications over the
gateway. This feature needs the support of the server developed by Witura
Corporation Sdn Bhd.
The media NAT (firewall) traversal is classified into four types:
A. No firewall
The firewall traversal mechanism is not supported.
B. Port Transparency/DMZ
The port transparency is used to transfer the network port on the LAN interface to
the computer or the server in the LAN. This feature enables external users
(through the Internet in most cases) to share the services of internal servers
(such as FTP, HTTP, and Telnet).
The port transparency supports the address of the gateway and response server.
The gateway is a communication device that connects two different networks. The
response server is a standard service device that implements the ECHO protocol.
3.5.6.3 Media NAT Traversal
31
GSM VOIP Gateway Series
GSM VOIP Gateway USER MANUAL – Rev1 – Technical Support: [e-mail]
COPYRIGHT ©2011 WITURA CORPORATION SDN BHD
A. RAS Port
The RAS is the communication protocol between the terminal and the Gatekeeper.
It is used to transmit the registration information, login, broadband change, and
the status between two H.323. The RAS port can be used to specify the UDP and
used with the router port for mapping.
B. Call Signaling Port (Q.931 Port)
H.225-Q.931 is a call control protocol of the H.323 for transmits ting the call
setting and unloading information between two H.323 units. It is used to specify
the Q.931 port (TCP) that receives call s and used with the router port for
mapping.
C. Media Control ol Port (H.245 Port)
H.245 is the media control protocol of the H.323. It is used to specify the port
that receives the H.245 connection (TCP) and used with the router port for
mapping.
D. Fast Start
You can enable or disable the fast start described in the H255.0 protocol. This
parameter is used to detect and solve the compatibility problem. If you are not
sure, do not set this parameter.
E. Fast Start Extension
This parameter is set for the special requirement of some customers. If you are
not sure, do not set this parameter.