VoIP can be deployed in many different network segments. To date, it has been mostly deployed in the backbone and enterprise networks. Deploying VoIP as an end-to-end Next-Generation Network solution introduces additional constraints and issues discussed in section 5.
Figure 1 shows an example VoIP Next Generation network with 3 service provider networks.
- Service Provider 1 is offering local access acting as a LEC. This Service Provider supports IP phones and IP PBX systems using SIP and POTS phones via either an Access Gateway (Next-Gen DLC) or a Subscriber Gateway (using either H.248 or MGCP).
- Service Provider 2 is acting as an inter-exchange carrier (IXC) and supports SIP and SIP-T or BICC signaling through its network.
- Service Provider 3 is offering local access acting as a LEC, but only supports POTS phones using an Access Gateway. SIP signaling is supported but is terminated by the SIP Server rather than using a SIP Phone or other CPE device.
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