User manual

44
GSM VOIP Gateway Series
GSM VOIP Gateway USER MANUAL – Rev1 – Technical Support: [e-mail]
COPYRIGHT ©2011 WITURA CORPORATION SDN BHD
In the advance option of the call setting, the signaling and media have separate
firewall setting, as shown in the following figures.
The traversal of H323 signaling over NAT (firewall) is classified into 4 categories:
A. No
The mechanism of firewall traversal is not supported.
B. Nat Citron
The Citron is a special firewall traversal protocol for GnuGK and used with GnuGK.
C. 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.
D. 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 of the trunk proxy server, port,
user name and password.
3.5.6.1 Traversal of H323 Signaling Over NAT
33
GSM VOIP Gateway Series
GSM VOIP Gateway USER MANUAL – Rev1 – Technical Support: [e-mail]
COPYRIGHT ©2011 WITURA CORPORATION SDN BHD
The SIP (Session Initiation Protocol) is a simple network protocol that has less
hierarchy and facilitates the initiation of calls among users. The call s may be
conducted between two or more users, which include the sounds, images, session,
interactive games, and virtual reality.
The VoIP channel of the GSM VOIP Gateway can be set in the following three
modes: single server, line setting, and trunk gateway.
Figure 3-31 Setting Mode in the SIP Terminal
A) Single server mode: Multiple VoIP channels can share the same setting.
B) Line setting: Each VoIP channel can be served by different service providers
or served by the same service provider. In the latter case, multiple different
telephone numbers (accounts) can be registered on the same service, so that
each telephone number is bound to the corresponding VoIP channel.
C) Trunk Gateway: This mode is used to establish the connection or channel
between the soft-switch and the gateway to realize the transit between two
ends.
3.5.2 SIP Phone
3.5.2.1 Setting Mode