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NOTE: The dashed lines represent the realization of information flows achieved by selecting specific protocol and interfaces to meet service requirements; this figure and its associated protocol choices is informative only.
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This section presents 10 examples of VoIP network configurations in a wide range of popular applications. Each example shows how the various functional entities might come together in physical devices and logical interactions to make up a VoIP network. In other words, each is just that an example of one possible implementation, and no example is intended to represent a best or even a preferred approach.
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The physical entities in this example consist of the MGC, Applications Server (AS), Trunk Gateway (TG), Access Gateway (AG), Signaling Gateway (SG) and a Media Server (MS) (see Figure 14-5). The MGC in this example is carrying out the MGC-F, R-F, and A-F. The MGC terminates all the signaling (either directly or transported over IP) and carries out signaling interworking (for example, a SIP phone wanting
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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SIP MGCP, H.248, SIP Application Server SIP (AS), Open APIs (FS) SIP Application Server Third Party Service Media Gateway Controller/Call Agent
SIGTRAN (M3UA/ SCTP)
Figure 14-5 The ISC Reference Architecture as it applies VoIP to a wireline model (Source: ISC)
Media Gateway Controller/Call Agent
Media Server
Signaling SIP/SIP-T, H.323, Q.BICC Signaling
H.323, SIP, MGCP, H.248
Media Gateway Control
MGCP H.248
Media IP Phone or Terminal (H.323, SIP, MGCP, H.248) RTP/RTCP SIGTRAN (M3UA, IUA, V5UA)
Signaling Gateway
IP Network
Media Gateway Control MGCP H.248
SS7/BICC ISUP INAP
PSTN/IN Signaling
Media RTP/RTCP
SS7/BICC
Wireline Access Network Wireless
Access Gateway
Media RTP/RTCP
Trunk Gateway
IN SCP
PSTN/IN
TDM/ATM
to signal to a PSTN network). It controls both the TG or AG for allocation of media resources. The MGC also authenticates and routes calls into the VoIP network and provides accounting information. Finally, the MGC interacts with other MGCs using either SIP/SIP-T, H.323, or Q.BICC. The AS has the service logic for applications, such as voice mail. Calls requiring these functions can be either handed over by the MGC to the AS for service control, or the application server can provide the information required for the service logic execution to the MGC. The AS can control the MS directly or pass control of the MS to the MGC. The TG terminates the physical media carrying the bearer (voice streams) from the PSTN, transcodes the bearer, and transports it over IP into the IP network. The TG is controlled by the MGC. The AG serves as the interface between the IP network and any wireline or wireless access network. The AG transports signaling over IP to the MGC while transcoding the bearer and transporting it over IP to an IP endpoint or to a TG for sending it to a circuit or other packet network. The MGF of the AG is controlled by the MGC.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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14
The SG terminates the physical media for the PSTN signaling and transports the PSTN signaling to and from the MGC over IP. The MS might perform tasks like announcements and digit collection, although the AG normally handles digit collection in most cases. The MS can be controlled either by the MGC, the AS, or both.
All-IP Network
This example (see Figure 14-6) shows an all-IP network with the following components (which could be grouped physically in many different ways):
IP phones These that can support SIP, MGCP, and/or H.323. H.323 Gatekeeper Domain administrator for H.323 based endpoints (R-F/A-F). Media Server For providing advanced media functionality, such as IVR (MS-F). SIP Proxy Routing and address translation entity for SIP-based endpoints (R-F/A-F).
AS APIs (JAIN, Parlay, etc.)
Figure 14-6 The ISC Reference Architecture version of the converged network, that is, all IP (Source: ISC)
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