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Past, Present, and Future of Softswitch
Application Server Logical entity where services are hosted. One AS can also communicate with other Application Servers, which may implement services using JAIN, Parlay, and so on. MGC/IW-F In this architecture, this entity is used for interworking protocols; that is, for when SIP, H.323, and MGCP endpoints that need to communicate with each other. The MGC is also used for routing and accounting functions for controlling MGCP phones. SIP Registrar A SIP entity that keeps current locations for SIP devices.
The SIP phones update the SIP Registrar with their current address and use the proxy for routing. In cases where a SIP phone needs to communicate with non-SIP entities, it signals the MGC, which in this example handles the IW-F with the other protocols. Note that it is also possible to offer legacy phone features to SIP phones via the AS/MGC. The MGCP phones contact the MGC for establishing and tearing down calls. The MGC also provides the R-F, A-F, and IW-F for the MGCP phone. In the case of an H.323 phone, the H.323 Gatekeeper provides the R-F and A-F. The MGC provides protocol IW-F when required to communicate with non-H.323 networks. In this case, media messages flow end-to-end between all media-capable devices using RTP/RTCP, regardless of the signaling protocol used. Hence, MGs are not required. An MG may be used if transcoding between different codecs is required, either on- or off-net. The billing and accounting information may be exchanged between the gatekeeper, SIP proxy, and/or the MGC for overall accounting purposes, especially in case of multiprotocol calls. The Application Servers may communicate directly with Media Servers or through the MGC to control the MS, as well as during the call to provide advanced media services like auto-attendant, IVR, conferencing, and so on.
VoIP Tandem Switching
The example above shows a softswitch used for tandem trunk switching, which replaces the conventional PSTN Class 4 tandem switching (see Figure 14-7). The SG provides signaling transport conversion from SS7-based signaling protocols to IP SIGTRAN-based signaling protocols and transports. The TG, controlled by the MGC, provides trunking media (voice) connectivity in tandem from PSTN to IP to PSTN.
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Past, Present, and Future of Softswitch
Figure 14-7 Reference Architecture for Class 4 (tandem) replacement (Source: ISC)
14
Signaling Gateway SIGTRAN
CA/MGC
MGCP/H .248
PSTN Trunking Gateway
IP Network
PSTN Trunking Gateway
POTS Carried over IP
This example shows the interconnection of a POTS phone to the PSTN via the IP network (see Figure 14-8). The POTS phone connects to the Residential Gateway (a type of Access Gateway). The RG performs the subscriber loop signaling and passes the signaling to the MGC using MGCP or the MEGACO protocol. The MGC in turn carries out signaling with the PSTN with the help of a Signaling Gateway. The RG digitizes and packetizes the analog voice and sends the digitized voice in RTP packets to the PSTN via the TG.
Access Network (V5/ISDN) over IP
This example shows a V5 or GR303 and an ISDN-based access network (see Figure 14-9). The AG performs V5 or GR303 and ISDN signaling with the access network. The AG terminates the physical connection carrying the V5 or ISDN signaling and transports it over IP to the MGC using SIGTRAN
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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