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Example dial plan rules
Cisco TelePresence ISDN Gateway 2.1 Online help (Printable format) 38 of 135
from a Polycom endpoint, replace the * with ##
from LifeSize and Sony endpoints, replace the * with #. For other endpoints, please refer to the
user manual.
It is possible to send an alphanumeric H.323 ID as a TCS-4 extension from most endpoints. For example,
you can dial 1234*MCU, where MCU is the registered H.323 ID with the gatekeeper (usually case
sensitive).
It is also possible to send an IP address as a TCS-4 extension from ISDN-capable Cisco TelePresence
endpoints.
IP > ISDN > ISDN > IP calls
When using TCS-4 in an "ISDN bridge between IP islands" (in which two IP endpoints/MCUs
communicate traversing an ISDN link), two ISDN Gateways are required. The first ISDN Gateway (for the
IP to ISDN conversion) cannot do TCS-4 because TCS-4 functionality only works in ISDN to IP direction.
However, the second ISDN Gateway will be able to process a TCS-4 request and therefore needs to be
set up with the TCS-4 dial plan as discussed above.
The first ISDN Gateway needs to forward a number to the second ISDN Gateway in the same format as a
TCS-4 request received from any other ISDN endpoint. That is why, even though the first ISDN Gateway
does not perform TCS-4 extension dialing, it should be set up so that it can call out with a number that is
same as sending a TCS-4 request to the second ISDN Gateway. This new functionality has been
implemented for the IP to ISDN dial plan on the ISDN Gateway, as described below.
When you dial from the calling IP endpoint, you need to send both the dial plan call-in match parameters
of the two ISDN Gateways as well as the required TCS-4 extension. Assume that:
the first ISDN Gateway dial plan call-in number match is 123
the second ISDN Gateway TCS-4 dial plan call-in number match is 456
the TCS-4 extension required to dial the called IP endpoint is 789
Dial the full number 123456#789 from the calling IP endpoint separating the 789 portion with the
appropriate * or # mark to indicate that this is the TCS-4 extension. The first ISDN Gateway strips the 123
portion from this number and sends the rest of the number 456789 to the second ISDN Gateway in such
a format that the second ISDN Gateway understands that the 456 portion is the dial plan match number
and the 789 is the TCS-4 extension. The second ISDN Gateway then dials the TCS-4 extension using its
TCS-4 dial plan.
To set up the first ISDN Gateway to send a number string that matches a TCS-4 request, a new
delimiter ! has been introduced. This delimiter is used to split the Call this number field, where
the part before the ! is the ISDN number to call, and the rest (after !) is the extension address to
respond to a TCS-4 request. Therefore, in the Call this number field, enter <ISDN number of
second GW>!<the TCS-4 extension used by the second ISDN Gateway>
To dial 123456#789 from an IP endpoint, set up the first ISDN Gateway with an IP to ISDN dial plan:
o Called number match : 123(D*)P(D*)
o Action: Call out number: $1 ! $2