TD 92326GB
2009-03-10 / Ver. E
Installation and Operation Manual
VoIP Gateway
150
21.12Enforce en-bloc dialling
The VoIP Gateway supports continuous digit-by-digit suffix dialling and no specific dial
digit is required to complete the dialled number. This behaviour resembles that of
customary PBXs.
The so called
Overlapped sendin
g is however not supported by all H.323-compatible
devices. When a call is set up to such a gateway it will not be able to process the suffix dial
code and the call will fail.
In such a case a hash (#) can be added to the dial prefix for a route. The gateway will then
wait until the user has dialled a hash before it sets up the call to the remote gateway. The
hash itself and any digits subsequently dialled are not transmitted to the remote gateway.
If always a fixed number of digits are required to complete the call number for this route
(for example, always 3-digit extensions), a corresponding number of full stops (periods)
can be added to the dial prefix ((...) for 3-digit extensions). The VoIP Gateway expects a
digit to follow each full-stop and then carries out the call without a hash having to be
dialled. Any digits subsequently dialled are not transmitted to the remote gateway.
The “Force en-bloc” check box can also be selected in the appropriate
Map
entry if the
number of digits required to complete the call is not constant for this route, and if dialling
is not to be explicitly completed with a hash. If such a
Map
entry takes effect, the gateway
collects the digits subsequently dialled until more than 4 seconds have elapsed since the
last digit was dialled. The call is then switched and any digits subsequently dialled are
ignored.
21.13Routes from and to Fax Machines
To activate this function, select the “Enable T.38” check box in the relevant gateway
definitions, see
GK – Configuration of the VoIP Interfaces
21.14Suppress Echo Compensation
Your VoIP Gateway implements
echo cancellation
for all voice connections that terminate
on a local ISDN interface. Echo compensation is automatically not carried out for data and
fax connections. In rare cases though, in may be that no echo compensation is to be
performed even though a connection is treated as a voice connection. This can be the
case, for example, with modem connections.
You can suppress echo compensation by checking the “Disable echo canceler” check box
in the relevant “Map” entry.
21.15Resources Management
The maximum number of permitted calls for a route can be limited, using resource
management, if there are only limited resources for a route, for example, due to the
bandwidth of the data connection being too small.
Resource management is configured in the map of the respective route.
A “Call Counter” name can be entered here and the maximum number of calls permitted
for this route can be defined in the ”max” calls field.
The system checks the number of calls taking this route and rejects calls exceeding the
specified number of calls. If another route is set up to this destination, this will then be
used.
