vb.net barcode generator Past, Present, and Future of Softswitch in Software

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Past, Present, and Future of Softswitch
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Past, Present, and Future of Softswitch
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Signaling Gateway MGC Analog Line
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Figure 14-8 Reference Architecture for POTS to IP interface (Source: ISC)
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MGCP/H.248
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IP Network
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PSTN Trunking Gateway
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Residential Gateway
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Figure 14-9 Reference Architecture for interfacing ISDN and V5 (GR303) (Source: ISC)
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MGCP/H.248 Signaling Gateway MGC Analog Line or ISDN BR/PRI
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SIGTRAN Signaling: V5UA or IUA
AN Access Gateway Media + V5 (V5.2) or GR303 ISDN (Q.921) Signaling
IP Network Trunking Gateway
PSTN
For GR303, AG terminates & translate into proper MGCP or H.248
(V5UA or IUA). For GR303, the AG terminates the signaling and translates it into proper events of MGCP or MEGACO for transport to the MGC. The AG packetizes and possibly transcodes the voice stream from the access network and sends the voice packets to the TG using RTP packets. The TG converts the packetized voice to circuit voice and transmits it to the PSTN over the physical circuit-switched trunks.
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Past, Present, and Future of Softswitch
14
Cable Network (e.g. PacketCable ) over IP
This example shows the implementation of a VoIP network using a cable access network (see Figure 14-10). The cable modem at the customer premises has an embedded Multimedia Terminal Adapter (MTA) implemented in a device called an Access Gateway (or Residential Gateway), which connects to the POTS phones and any Ethernet-based devices. An MTA can be standalone or embedded into the cable modem; a standalone MTA interfaces to the cable modem via Ethernet. The MTA terminates the subscriber loop signaling to and from the POTS phone and communicates the signaling over IP (NCS or SIP) via the CMTS to the MGC. Network Control Signaling (NOS) is a modified form of MGCP. The MGC performs signaling with the PSTN using the Signaling Gateway. The MTA also terminates analog voice from the POTS phone, digitizes and packetizes the voice, and carries it over IP via the CM/CMTS cable network to the TG in RTP packets. The MGC controls the TG with TGCP (a modified form of MGCP). To be fully PacketCable compliant, the MGC-F would also have to communicate with the CMTS using signaling such as COPS. To ensure QoS when deploying VoIP over cable, the MGC communicates with the CMTS using the Dynamic QoS (DQoS) and COPS protocols.
Figure 14-10 Reference Architecture for converging voice and data via cable TV applications (Source: ISC)
IP over HFC Analog Line Cable Modem DOCSIS Network
NCS or SIP
CA/MGC
Signaling Gateway
IP Network
Ethernet AG: MTA
CMTS
RTP Trunking Gateway
PSTN
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.
Past, Present, and Future of Softswitch
Past, Present, and Future of Softswitch
VoDSL and IAD over IP
This example shows the implementation of a VoIP network using a DSL access network (see Figure 14-11). The Integrated Access Device (IAD) at the customer premises (also called Access Gateway or Residential Gateway, or asymmetric subscriber line termination unit) connects to the POTS phone and any Ethernet-based devices. The IAD provides the subscriber loop signaling and communicates the signaling over IP (MGCP or MEGACO) via the DSLAM to the MGC. The MGC carries out signaling with the PSTN using the SG. The IAD also digitizes and packetizes the voice and carries it over IP via the DSLAM to the TG in RTP packets.
Wireless (3GPP R99 Special Case NGN)
This example shows how the wireless GSM/3G packet network connects to the PSTN or PLMN via the VoIP network (see Figure 14-12). The AG terminates the signaling (BSSAP in GSM or RANAP in 3G) from the radio access network (RAN) over E1/T1/ATM interfaces. It transports the signaling messages over IP to the MSC Server using SIGTRAN. The MSC and GMSC servers carry out the same functionality as an MGC, including signaling with the PSTN via the SG, or to the PLMN via the GMSC server. The
Figure 14-11 VoIP and DSL in Reference Architecture (Source: ISC)
IP over ATM Analog Line AG:IAD DSL Network
MGCP or Megaco
Packet Network (IP or ATM) DSLAM
Ethernet ATU-R
RTP Trunking Gateway
PSTN
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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