Table of Contents
Advertisement
•
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 possible to send an IP address as a TCS-4 extension only from Cisco endpoints; most other
manufacturers do not support this.
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 is a functionality that 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 explained 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:
Called number match : 123(D*)P(D*)
o
Action: Call out number: $1 ! $2
o
Cisco TelePresence ISDN Gateways v2.0 Online help (Printable format)
Example dial plan rules
37 of 116
Hide quick links:
Advertisement
Table of Contents
