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Chapter 6 <br />

Like conventional outgoing telephone calls, a VoIP call is subject to the ARS mechanisms: link<br />

categories, ARS time slot management, overflow on busy, etc.<br />

In the diagram below sites A and B are Alcatel-Lucent OmniPCX Office Communication<br />

Servers. Site C is a remote system integrating a SIP gateway.<br />

- @IP1 : IP address of the PowerCPU board at site A -<br />

- @IP2 : IP address of the PowerCPU board at site B. For example: 192.189.50.120<br />

Basic call<br />

The site A stations call the site B stations by dialing their internal numbers:<br />

Internal numbering plan (site A):<br />

Function Start End Base NMT Priv<br />

Secondary trunk group 2 2 ARS Keep Yes<br />

ARS Table:<br />

Network Access Range Substitute List. Trunk<br />

group list<br />

Called Party<br />

(ISVPN/H45<br />

0)<br />

Comment<br />

Priv. 2 00-49 2 4 het SIP to site B<br />

- By default, the "Called(ISVPN/H450)" field is set to "het" (heterogeneous). When set to<br />

"hom" (homogeneous), a remote IP is expected to support optimized forwarding and<br />

transfer; local and remote numbering plans are supposed to be consistent. Moreover, CLIP<br />

6-98

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