NEC SL1100, Networking Manual

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Networking Manual 10 - 1
IP Sing
le Line T
e
le
phone
10
IP Single Line Telephone
S
ECTION
1
I
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 VoIPDB up to 32 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 VoIPDB DSP
Resource. This is a required component of SIP implementation in the NEC
SL1100. The NEC SL1100 VoIPDB contains a regular TCP/RTP/IP stack
that can handle real-time media and supports industry standard SIP
(RFC3261) communication on the WAN side.
Enhancements
With SL1100 Version 4000 (4.00 or higher) software:
• The system has the ability to receive DTMF information in SIP INFO
messages sent by Standard SIP Terminals. This allows the SIP Terminal to
initiate features during a ringing state such as CAMP ON and Message
Waiting.
• NAT Mode for Standard SIP terminal.
• Support standard SIP Phone, ITX-1DE-1W(BK)TEL. Refer to the ITX-1DE-
1W(BK) TEL User Manual for more detail.
•
Support system time updates to standard SIP terminals using NTP time server
settings.