Interop Tweaks - ASCOM TD 92326GB Installation And Operation Manual

Installation and Operation Manual
VoIP Gateway
a number of gatekeepers in parallel within a network, with each terminal nevertheless
identifying the "correct" gatekeeper by means of "gatekeeper discovery".
If you have assigned your gateway a Gatekeeper ID, it will only answer those RAS
Discovery inquiries in which either this ID, or no Gatekeeper ID at all, is specified. Even if
your terminals have configured the gatekeeper permanently and therefore do not perform
gatekeeper discovery, the RAS registrations are again only accepted if they include the
configuration of the correct gatekeeper ID or of no gatekeeper ID at all.
A configured Gatekeeper ID applies to the entire gateway.
In general, you can operate without Gatekeeper ID if only one gatekeeper is operated in
your network or if Gatekeeper discovery is not used.
19.1.3 H.323 Interop Tweaks
With regard to communication with other VoIP devices, the VoIP Gateway supports a
series of protocol options which affect certain details of its behaviour. These options are
available regardless of the VoIP Gateway mode used.
H.323 protocol options
Option
No Faststart
No H245-
tunneling
Enable T.38
Enable PCM
2009-03-10 / Ver. E
Description
Default settings allow the H245 Faststart procedure which means
that outgoing calls are implemented with Faststart and incoming
calls with Faststart are answered with Faststart.
If the "No Faststart" option is activated outgoing calls are made
without Faststart and incoming calls, with or without Faststart, are
answered without Faststart.
We only recommend activating the "No Faststart" option if
compatibility problems occur with third party products.
Note: Some ring tones might not be audible if connections are
established to end points with H.323 version 2. In this case, update
the protocol of the remote entity.
In the default settings, the voice data connection is negotiated in
the TCP signalling connection
advantage in connection with NAT and firewalls. This applies to the
signalling connection out of the gatekeeper.
If "No H245-tunneling" is activated, a separate TCP connection is
established for this negotiation.
We only recommend disabling the H245 tunnelling if compatibility
problems occur with third party products.
Note: Some ring tones might not be audible if connections are
established to end points with H.323 version 2. In this case, update
the protocol of the remote entity.
Voice connections used for transmitting a fax use the special Fax
over IP protocol "T.38". Otherwise fax transmissions are not treated
specially.
We always recommend this option unless compatibility problems
occur with third party products.
Activates the Pulse Code manipulation (PCM). An ITU standard for
digitalization of voice. Optional.
a
already available, which can be of
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