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Voice Feature Guide 01

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Voice Service Networking Applications

Voice Service Networking Applications

Voice services, including POTS, fax, modem, ISDN, and R2 services, apply to multiservice access node (MSAN), fiber to the building (FTTB), fiber to the curb (FTTC), fiber to the home (FTTH), fiber to the office (FTTO), and enterprise private line scenarios.

Networking Applications

An access gateway (AG) supports the following functions:
  • Complies with SIP, H.248, or MGCP, and works with the softswitch or IMS to support the VoIP service.
  • Supports ISDN BRA and PRA services.
  • Supports the R2 service over E1 lines.
  • Supports fax (FoIP) and modem (MoIP) services.
  • Supports the TDM SHDSL service using V.35 or E1 upstream transmission, reconstructing traditional voice networks. Compared with the V.35 and E1 services, the TDM SHDSL service supports a longer transmission distance.
    • Prolonged E1 transmission distances: The TDM SHDSL modem on the user side connects to the PBX using an E1 (ISDN PRI) interface, and the modem connects to the AG in TDM G.SHDSL access mode. Then, the AG sends signaling streams to the IP network and exchanges voice service flows with other voice devices using a media gateway (MG).
    • Prolonged V.35 transmission distances: The TDM SHDSL modem on the user side connects to the user-side device using a V.35 (N x 64 kbit/s private line) interface, and the modem connects to the AG in TDM SHDSL access mode. Then, the AG sends data to a DDN network using an SDH network, implementing N x 64 kbit/s DDN private line access.
Figure 1-5 Voice service networking

SIP and H.248 Dual-Upstream Transmission

An AG supports both SIP and H.248 upstream transmission. This upstream mode supports smooth migration from a softswitch network to an IP multimedia subsystem (IMS) network, as shown in Figure 1-6. The SIP and H.248 dual-upstream transmission applies to network reconstructions.
  • IMS networks provide more value-added services. For the users to be able to migrate from softswitch to IMS, the AG can switch the upstream transmission mode from H.248 to SIP, ensuring that the migration does not interrupt other users' services.
  • Each virtual access gateway (VAG) can be configured to support H.248 or SIP.
  • The maximum number of users supported by an AG with both H.248 and SIP enabled is the same as that supported by the AG with either of the protocols enabled.
Figure 1-6 Dual-upstream transmission networking
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Updated: 2019-02-22

Document ID: EDOC1100067358

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