Configuring ISDN ports settings
Cisco TelePresence ISDN Gateway 2.1 Online help (Printable format) 78 of 135
calls may arrive at any one of the ports
with a shared directory number.
Note that when receiving an incoming
ISDN call, the gateway advertises the
directory numbers of the ports selected
in the dial plan. If no directory number is
specified, it assumes the directory
number of the nearest lower-numbered
port. If no ports have a specified
directory number, the calling endpoint
will be instructed to use the same
number to place subsequent calls as it
used to make the first call.
Prefix for
national
calling party
numbers
The national prefix that the ISDN
Gateway adds.
This setting adds a prefix to the calling
party number information which the
ISDN Gateway gets from an incoming
ISDN call and then sends out over the
IP part of the call.
This calling party number can then be
used by an IP participant to return a call
to the ISDN participant.
This feature should be used in
conjunction with the overall dial plan
mechanism.
Prefix for
international
calling party
numbers
The international prefix that the ISDN
Gateway adds.
This setting adds a prefix to the calling
party number information which the
ISDN Gateway gets from an incoming
ISDN call and then sends out over the
IP part of the call.
This calling party number can then be
used by an IP participant to return a call
to the ISDN participant.
This feature should be used in
conjunction with the overall dial plan
mechanism.
Low channel
The lowest numbered B-channel
available.
An ISDN PRI comprises a number of B-
channels. A complete PRI has 30
available B-channels when using E1,
and 23 when using T1 or J1. Your ISDN
network provider may offer a complete
or fractional PRI (where a reduced
number of B-channels are available). In
either case, the low channel number is
generally 1.
Refer to your ISDN network provider if
you are unsure of which value to use
here.
High channel
The highest numbered B-channel
available or Max.
An ISDN PRI comprises a number of B-
channels. A complete PRI has 30
available B-channels when using E1,
and 23 when using T1 or J1. Your ISDN
network provider may offer a complete
or fractional PRI (where a reduced
number of B-channels are available).