NEC Univerge SV9100 Manual page 469

The SIP Station feature set supports the HOLD and TRF features based on RFC
draft.
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Enhancements
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9-2
voice at rates of 16-, 24-, 32-, and 40Kbps.
Draft-Ietf-sipping-service-examples-09.txt.
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.
When out of band DTMF is used, via RFC2833. The IPLE supports an out of band
DTMF payload of 96 ~ 127.
If a user on a standard SIP phone is talking to another station via voice announce
(receiving station has not pressed speaker or lifted the handset) and the SIP phone
presses transfer or hold, the call will be terminated. A standard SIP call cannot be
placed on hold or transferred until the other party answers.
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.
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. SIP Terminal must support
this feature and have it enabled.
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.
The SV9100 supports NAT for Standard SIP Terminals.
With Version 2000 (2.00 or higher) Standard SIP Conference is supported.
Issue 2.0
IP Single Line Telephone (SIP)