Yealink VC110, Administrator'S Manual

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Configuring Network
101
H. 323 includes signal based on TCP, while the STUN solution cannot realize the NAT
traversal of TCP. Before the emergence of H.460, Enterprises have their own firewall/NAT
traversal solutions, which are incompatible with each other. Therefore, IP
communication between enterprises is difficult. H.460 resolves the compatibility
problem.
H.460 enables H.323 signaling and media to traverse firewall. H.460 is a set of
extensions to the ITU H.323 standard that include methods to traverse firewalls. Devices
that use H.460, implement a set of security policies that a firewall is configurable to
accept. Therefore using H.460, video conferencing endpoints can communicate across
a firewall. You can configure the endpoint to use standard-based H.460.18 and H.460.19
firewall traversal, which allows the endpoint to establish IP connections across firewalls
more easily.
The H.460.18 deals with signaling. The H.460.18 solution perpetually hunts in order to
open pinholes from the internal network to the external one. Without using the H.460.18
solution, which permits the gatekeeper to open a connection, the external device could
not communicate with internal device, because the firewall would obstruct its attempt to
setup a call. H.460.19 extends H.323 by defining the NAT/firewall mechanism for media.
In addition, H.460.19 provides a solution for opening RTP and RTCP pinholes and a
method for maintaining them using a keep-alive mechanism.
To use H.460, you need to deploy a Traversal Server (TS) at public network.
The following illustration shows how a H.460 traversal server works between two
enterprise locations.
The H.460 firewall traversal parameter is described below:
Parameter Description Configuration Method
H.460 Active
Enables or disables H.460
firewall traversal feature on the
endpoint.
Default: Disabled
Remote Control
Web User Interface