Supported Codec - NEC SL1100 Networking Manual

NEC SL1100
4.5
S
S 5
UPPORTED
ECTION
The functions in this section are supported by NEC SL1100 SIP Trunking.
5.1
5.2
Networking Manual

Supported CODEC

SIP Trunking can use the following CODECs.
G.729. Low bandwidth requirement, and is used on most Wide Area

Network links
VAD

VIF size 20ms~30ms

G.711 – 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 voice at rates of 16, 24, 32, and 40Kbps.
ILBC (Internet Low Bitrate CODEC) – Narrow band speech. ILBC

enables graceful speech quality degradation for lost frames, which
occurs in connection with lost or delayed IP packets
SIP T
RUNKING
Address Resolution
If using any SIP Proxy Server, the NEC SL1100 always sends messages to an
external SIP server.
If not using any SIP Proxy Server, the NEC SL1100 uses the internal address
table (Program 10-23 : SIP System Interconnection Setup).
When a user creates an interconnection network with SIP trunks,
10-29-14 : SIP Server Information Setup - SIP Carrier Choice
(default).
Authentication Process
When using an external SIP Server provided by a carrier, an authentication
process is usually needed.
NEC SL1100 SIP trunks support HTTP digest authentication process (MD5).
This process is done on a Register process and Initial INVITE process.
F
UNCTIONS
Issue 6.0
Program
must be set to 0
7 - 7