Ericsson ECN330 Guia do Utilizador Página 81

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Telephony and Multimedia Services
1/1551-HSC 901 35/3 Uen C 2005-12-02
75
exchange is limited only by capacity and capabilities of the packet based
and/or circuit switched networks. Figure 53 on page 75 shows possible
locations of local exchanges and voice gateways.
Figure 53 Locations of VoGW and Local Exchange
8.2.1 Quality Considerations
Reliability
Telephony over IP in EDA provides highly reliable telephony service,
implemented on carrier grade HW platforms.
Speech Path
ToIP is provided with full 64kbit/s G.711 coding with packet loss
concealment (lost packet regeneration). Differentiated services, packet
fragmentation and other measures are implemented to ensure low latency
and jitter throughout the EDA network. The result is a voice quality similar
to normal POTS and capable of carrying DTMF, Fax and legacy modem
signalling. For more detailed information on how QoS is provided in EDA
(see section 8.5 on page 78).
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