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1.46 Case II: Two-site configuration
This case describes the typical settings of a two-site configuration; say Company B headquarters B-
HQ and its branch B-BR located in another country. Assume each site has a DSL connection for
Internet access. B-HQ has 4 PSTN subscriber lines and B-BR has 2 lines as shown in
Figure 6-2
.
The provisioning tasks include:
˙
Both sites have staff phones in cubes and offices and utility phones in public areas.
˙
Each phone has one extension. A utility phones can call extensions within the site it is in only,
while the staff phones can call any extension in both sites without limitation. B-HQ has
extensions 1XX and B-BR has extensions 2XX.
˙
Calls between B-HQ and B-BR use private SIP trunks across Internet. IP PBX at B-HQ has a
static IP address, 64.1.0.1 and IP PBX at B-BR has a static IP address, 222.44.0.1.
˙
Only staff phones can call out to PSTN with a prefix 9.
˙
B-HQ staff phones call out starting with 90118621 will relay to B-BR through the SIP trunk and
then hop off to PSTN in B-BR. Similarly, B-BR staff phones call out starting with 9001408 will
relay to B-HQ for PSTN hop-off.
˙
Incoming PSTN calls are answered by auto attendant and could be transferred to any
extension.
Figure 6-2
Configuration steps in B-HQ:
1.
Create usergroups named
staff
,
utility
, and
ext-all
.
2.
Add
staff
and
utility
in the Reachable User Groups of
ext-all
.
3.
Create a user account for each staff and assign it to usergroup
staff
.
4.
Create an additional user account named
public
and assign it to usergroup
utility
.
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