NEC Univerge SV9100 Manual page 468

IP Single Line Telephone (SIP)
S 1 I
ECTION NTRODUCTION
Session Initiation Protocol (SIP) Station feature provides Voice over Internet Protocol
(VoIP) for IP stations. This feature is defined by the Internet Engineering Task Force
(IETF) RFC3261.
SIP analyzes requests from clients and retrieves responses from servers, then sets
call parameters at either end of the communication, handles call transfer and
terminates. Typically, Voice over IP services are available from an SIP service
provider.
With the GPZ-IPLE up to 256 TDM talk paths are supported. This total may be
shared among SIP stations or SIP trunks. Registered SIP stations and/or SIP trunks
require a one-to-one relation with the GPZ-IPLE DSP Resource. This is a required
component of SIP implementation in the UNIVERGE SV9100. The UNIVERGE
SV9100 GPZ-IPLE contains a regular TCP/RTP/IP stack that can handle real-time
media and supports industry standard SIP (RFC3261) communication on the WAN
side.
For this feature, the GPZ-IPLE is installed and assigned. The GPZ-IPLE supports IP
signaling for up to 256 (SIP Trunks and/or SIP Stations) and reduces the maximum
capacity of system stations and/or Trunks in accordance with the number of
registered SIP Stations.
A maximum of (1) GPZ-IPLE can be installed per UNIVERGE SV9100 System,
supporting the maximum of 896 IP stations.
The UNIVERGE SV9100 supports the following CODECS that are considered to
provide toll-quality equivalent speech path.
The following voice compression methods are supported for the IP Station SIP
feature:
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SV9100 Networking Manual
G.729. Low bandwidth requirement used on most Wide Area Network links.
G.711. A/Law High bandwidth requirement usually used on Local Area
–
Networks.
G.722 This CODEC is useful in fixed network, Voice over IP applications, where the
required bandwidth is typically not prohibitive.
G.726 is an ITU-T ADPCM speech-coded standard covering the transmission of
UNIVERGE ® SV9100
Chapter 9
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