Interzone Alarm Setup
Figure 8-12 shows how gatekeepers arresting anniversary added in a multizone attendant network.
It shows the arrangement of RAS signaling contest amid gatekeepers, the LRQ RAS messages,
and how an LRQ RAS bulletin is used.
462 Authorized Self-Study Guide: Cisco Voice over IP (CVOICE)
Phone A
801...
1
V
Phone B
408...
2
5
V
9
6
7
3
4
8
12
10 11
13
Gatekeeper 1 Attendant 2
GK1 GK2
Gateway A Gateway B
Figure 8-12 Interzone Alarm Setup
The basal gateway-to-gatekeeper signaling that occurs amid zones is as follows:
1. Buzz A dials the buzz cardinal 408 555-2001 for Buzz B.
2. Gateway A sends Attendant 1 an ARQ, allurement permission to alarm Buzz B.
3. Attendant 1 does a lookup and does not acquisition Buzz B registered. Attendant 1
does a prefix lookup and finds a bout with Attendant 2. Attendant 1 sends an
LRQ to Attendant 2 and a RIP to Gateway A.
4. Attendant 2 does a lookup, finds Buzz B registered, and allotment an LCF to
Gatekeeper 1 with the IP abode of Gateway B.
5. Attendant 1 allotment an ACF with the IP abode of Gateway B.
6. Gateway A sends an H.225 alarm bureaucracy bulletin to Gateway B with the buzz number
of Buzz B.
7. Gateway B sends an H.225 alarm proceeding bulletin to Gateway A.
8. Gateway B sends Attendant 2 an ARQ, allurement permission to acknowledgment the alarm from
Gateway A.
9. Attendant 2 allotment an ACF with the IP abode of Gateway A.
10. Gateway B and Gateway A admit an H.245 adequacy barter and accessible logical
channels.
11. Gateway B sets up a POTS alarm to Buzz B at 408 555-2001.
12. Gateway B sends a alarm affix to Gateway A.
13. Dual RTP streams breeze amid the gateways.