coM.sat ISDN Basic UMTS

coM.sat ISDN Basic UMTS
channel is assigned to the first GSM/UMTS channel. Fixed assignment of the
channels can be useful if e.g. different network providers are to be used for the two
GSM/UMTS channels. If the channels are freely assigned, the call is assigned to the
first free channel. If one channel is busy, the other is used. In the case of free
channel allocation there is the additional option "Use channels alternatingly". The
GSM/UMTS channels are selected alternatingly. This feature can be used to balance
the load (the cost) evenly between channels. If this box is not checked, there will be a
bias towards one channel!
The “Progress Indicator” setting influences the value of an ISDN information
element. The first value “Call is not end-to-end ISDN” informs the connected PBX
that its call uses a different network to be connected. The other value “In-band
information now available” informs the PBX that an announcement or a tone is
available and must be transferred to the calling user. This value is usually needed for
correct operation, whereas the first value may be needed by specific PBXs. If the
progress indicator causes a problem in the PBX, it is possible to switch it off
completely with the third option “Do not send progress indicator“.
The “Dial Timeout“ is the time that may pass between the last digit of the phone
number being dialled and the selection process is passed into the GSM/UMTS
network. This time is usually set to 5 secs. It can be reduced to 1 second. The
maximum possible setting is 10 secs. The time between dialling the last digit and
hearing the dialling tone can be reduced by reducing this time.
Note: In some telephone systems, dialling can also be concluded by pressing the “#“
key. In this case there is no waiting time.
The “Send Alerting Message“ option is used to set whether the “Alerting“message
is generated by coM.sat ISDN Basic UMTS for calls to PBX. If this option is selected,
the “Alerting“ message is inserted by coM.sat ISDN Basic UMTS for an outgoing call
after the “Setup“. If the option is not activated, the “Alerting“message is suppressed
and the call is continued with “Call Proceeding“. Use of this option also depends on
the properties of the connected telephone system.
coM.sat ISDN Basic UMTS always generates the dialling tone (exchange dialling
tone) itself and transfers the ringing tone or the network provider announcements to
the B-channel. Whether the ringing tone or the network provider announcements
from the GSM/UMTS network are used in the B-channel or the ringing tone
generated by the telephone system is used now depends on whether the “Alerting“
option has been activated or is passive.
The “Enable DTMF in TE Mode“ option must be used if the coM.sat ISDN Basic
UMTS is connected to a PBX in TE mode which does not support overlapped
sending of dial information (which is the usual case). Then the GSM/UMTS number is
dialled with the aid of DTMF tones.
The "March Root Tone" serves to bridge delays with a tone or sequence of tones in
order to prevent the impression that the line is "dead", particularly during the call
setup. The MC8775V modules produce the “march root tone” on their own. If the tone
of the ISDN Basic UMTS is to be used, the tone of the MC8775V module should be
switched off. The duration of the tone is set in the input box: 30 represents a tone of
created: page: file:
11/04/07 35 coMsat ISDN Basic Manual UMTS.doc
Note Protection Mark according to DIN 34!