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SIP Release Notes 28 Document #: LTRT-26901
CPE SIP Products
3. Adapting Comfort Noise to Remote Party:
Product
MP-11x MP-124
Mediant 600 Mediant 1000
Mediant 800 MSBG Mediant 1000 MSBG
Mediant 2000
Mediant 3000/TP-6310 Mediant 3000 HA/TP-6310
Mediant 3000/TP-8410 Mediant 3000 HA/TP-8410
Management Protocol
Web INI
SNMP
EMS
CLI
This feature enhances the device’s negotiation of comfort noise generation (CNG)
between SIP UAs. The device always attempts to adapt to the remote UA’s request for
CNG, even if silence suppression (SCE) is disabled for the voice codec.
CNG is indicated in the SIP INVITE’s SDP media description line as “CN”, i.e., payload
type 13 (relevant only for G.711 and G.726 codecs).
To determine CNG support, the device uses the parameters ComfortNoiseNegotiation
and EnableStandardSIDPayloadType, and the codec’s SCE setting (enabled or
disabled). If the ComfortNoiseNegotiation and EnableStandardSIDPayloadType
parameters are enabled, then the following occurs:
• If the device is the initiator, it sends a “CN” in the SDP only if the SCE of the
codec is enabled. If the remote UA responds with a “CN” in the SDP, then CNG
occurs; otherwise, CNG does not occur.
• If the device is the receiver and the remote SIP UA does not send a “CN” in the
SDP, then no CNG occurs. If the remote side sends a “CN”, then CNG occurs
even if the codec’s SCE is disabled.
If the ComfortNoiseNegotiation parameter is disabled, then the device does not send
“CN” in the SDP, unless the EnableStandardSIDPayloadType parameter and the
codec’s SCE are enabled, in which case, CNG occurs.
4. Hotline Duration per Port for Automatic Dialing:
Product
MP-11x MP-124
Mediant 600 Mediant 1000
Mediant 800 MSBG Mediant 1000 MSBG
Mediant 2000
Mediant 3000/TP-6310 Mediant 3000 HA/TP-6310
Mediant 3000/TP-8410 Mediant 3000 HA/TP-8410
Management Protocol
Web INI
SNMP
EMS
CLI
This feature allows the configuration of a timeout per port (channel) for automatic
dialing when the Hotline feature is enabled. If the phone (connected to the specific
port) is off-hooked and no digit is pressed for this user-defined duration (timeout), the
device automatically initiates a call to the user-defined destination phone number. This
timeout is configured using the new parameter, HotLineToneDuration in the existing
Automatic Dialing table (TargetOfChannel parameter). This parameter has a value
range of 0 to 60 seconds and default of 16.