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Configuring general ISDN settings
Cisco TelePresence ISDN Gateway 2.1 Online help (Printable format) 72 of 135
find that outbound calls fail (and
inbound calls succeed), then try
disabling this setting
Select the Legacy capabilities
option if you experience difficulties
connecting your older endpoints to
the ISDN GW. When enabled, the
ISDN Gateway will detect when
one of those endpoints is being
called and send a reduced
capability set
Send calling
number to
ISDN network
Select the appropriate setting. Some
networks do not allow you to set this
and the call will fail if you; in others,
the call will only work if the caller's
number is forwarded and the DN is
set exactly right; and in most
networks, the setting is completely
ignored. Experiment and see which
setting works best.
Select Always if you want all IP to
ISDN calls to forward the caller's
number where available
Select Only if numeric to forward
only numeric caller numbers
Select Never if IP to ISDN calls
should never forward the caller's
number
Max incoming
ISDN call rate
Select the maximum bandwidth at
which the ISDN side of ISDN to IP
calls can be established. The options
offered show the bandwidth in terms
of Kbps, and the corresponding
number of ISDN B-channels required.
This setting also enables you to use
the ISDN Gateway as a PSTN to
voice-over-IP gateway (that is, as a
voice-only gateway, rather than a
video-conferencing gateway); in this
case, set the call rate to Telephone.
Voice calls from the PSTN can then
be placed to IP telephones.
The value entered is the maximum
bandwidth for an incoming ISDN call. The
dial plan cannot override this value with a
higher maximum bandwidth. However, by
using the dial plan you can impose a lower
bandwidth for particular calls. Also, note
that the calling ISDN endpoint may elect to
establish a call at a lower bandwidth.
If you have selected Telephone, then the
ISDN Gateway will forward ISDN calls as
audio-only IP calls (see
Using the ISDN
Gateway for voice-only calls).
Max outgoing
ISDN call rate
Select the maximum bandwidth at
which the ISDN side of IP to ISDN
calls can be established. The options
offered show the bandwidth in terms
of Kbps, and the corresponding
number of ISDN B-channels required.
This setting also enables you to use
the ISDN Gateway as a voice-over-IP
to PSTN gateway (that is, as a voice-
only gateway, rather than a video-
conferencing gateway); in this case,
set the call rate to Telephone. Voice
calls from IP telephones can then be
placed to regular PSTN telephones.
The value you enter here is the maximum
bandwidth for an outgoing ISDN call. The
dial plan cannot override this value with a
higher maximum bandwidth. However, by
using the dial plan you can impose a lower
bandwidth for particular calls. Also, note
that the calling ISDN endpoint may elect to
establish a call at a lower bandwidth.
If you have selected Telephone, then the
ISDN Gateway will forward IP calls as
audio-only ISDN calls (see
Using the ISDN
Gateway for voice-only calls).
Maximum call
duration
Limits the length of all calls unless
you select no time limit.
You may wish to impose a maximum call
duration to limit ISDN calling costs.