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Figure 6.16: SIP Trunking Topology with Hosted NAT in the Provider Network<br />

- SIP ALG: This topology requires a customer border element performing level 5 NAT (SIP<br />

ALG). The customer border element operates as outbound proxy for Alcatel-Lucent<br />

OmniPCX Office Communication Server.<br />

If DNS SRV is used, DNS resolution consists in resolving the service/name of the<br />

customer border element. DNS servers must belong to customer network.<br />

Figure 6.17: SIP Trunking Topology with SIP ALG in the Customer Border Element<br />

6.4.2.2.5 SIP Trunking through the Internet<br />

In this case, the customer network is connected to the SIP provider through the Internet.<br />

Hosted NAT or SIP ALG, as described in SIP Trunking in a Managed IP Network , are possible<br />

deployment configurations.<br />

6.4.2.2.6 Trunking with multiple SIP Registrar<br />

From R8.0 Alcatel-Lucent OmniPCX Office Communication Server is able to register with<br />

multiple registrars. Simultaneous connection to SIP access provider and SIP/GSM gateway is<br />

supported.<br />

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