Cascading Conferences
Polycom, Inc. 73
[Destination number] - The destination number as alias, IPv4 address or ISDN (audio/video) number
of participant B.
The dialing string format:
H.323 Participants connecting to another IP participant via a Gateway to Gateway call over an ISDN-video
link enter a dial string using the format:
<GW A Prefix in GK><Gateway Profile_ID on GW A>*<Destination ISDN-video Dial-in number assigned to
the Gateway Session Profile GW B>*<Destination Number, participant>
For example:
H.323 participant dials: 229999*4444103, and when prompted for the Destination number enters 3456
followed by the pound key (#) using DTMF codes
SIP Participants connecting to another IP participant via a Gateway to Gateway call over an ISDN-video link
enter a dial string using the format:
<Gateway Profile_ID on GW A>@<Central Signaling IP GW A>*<Destination ISDN-video
Dial-in number assigned to the Gateway Session Profile GW B>*<Destination
Number, participant>
For example:
If Central Signaling IP address of Gateway A is 172.22.177.89, SIP participant dials: 9999@
172.22.177.89* 4444103 and when prompted for the Destination number enters 3456 followed by the
pound key (#) using DTMF codes.
Gateway to MCU Calls via ISDN-video Cascading Link
When H.323 participants connects to a conference/Meeting Room via a Gateway to MCU call over an
ISDN-video link, the dialing string includes the following components:
[GW A prefix in GK] - The prefix with which Gateway A is registered to the gatekeeper.
[GW Profile ID on GW A] - The ID of the Gateway Profile on GW A to be used for routing the call to
the Meeting Room/conference running on MCU B.
[Conference/Meeting Room/Entry Queue ISDN (audio/video) number] - The dial-in number
assigned to the Entry Queue/Meeting Room/Conference defined on MCU B, including the required country
and area codes.
Information required that is not part of the dialing string:
[Destination Conference ID] - Only if using the Entry Queue on MCU B for routing calls or creating
new ad hoc conferences. The ID of the destination conference on MCU B.
The dialing string format:
GW A prefix in Gatekeeper - (not used with SIP) 22
Gateway Profile ID in GW A 9999
ISDN-video Dial-in Number assigned to the Gateway
Session Profile GW B
4444103
IP Participant Alias 3456
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