NEC SL1100 Networking Manual page 214

Issue 6.0
For this feature, the VoIPDB is installed and assigned. The VoIPDB supports IP
signaling for up to 32 (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.
The NEC SL1100 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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The SIP Station feature set supports the HOLD and TRF features based on RFC
draft.
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10 - 2
G.729. Low bandwidth requirement used on most Wide Area Network links.
G.711. Law
High bandwidth requirement usually used on Local Area
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Networks.
G.723. Low bandwidth requirement not commonly used.
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
voice at rates of 16-, 24-, 32-, and 40Kbps.
ILBC (Internet Low Bitrate CODEC) Narrow band speech. ILBC enables
graceful speech quality degradation in the case of lost frames, which occurs in
connection with lost or delayed IP packets.
Draft-IETF-sipping-service-examples-09.txt.
Section 2.5 Draft-ietf-sipping-service-examples- (Transfer - Attended) 15.txt
IETF RFC is defined as: Internet Engineering Task Force (RFC) Request for
Comments.
The SIP Station feature set supports the Message Waiting Indication (MWI)
based on RFC3842.
SIP INFO works independent from other DTMF methods such as RFC2833.
This means SIP Terminals should send DTMF information by a single method,
otherwise the system will receive both separately causing double digits.
When PRG 15-05-49 is set to 2: Allowed while RTP is not available, SIP INFO
will be received while RTP is not established. In-band method such as
RFC2833 will be used once voice path is established.
When PRG 15-05-49 is set to 1: Allowed any time, SIP INFO will be received
whenever they arrive.
NEC SL1100
IP Single Line Telephone