AASTRA SIP-DECT (Release 2.1)- OM System Manual - Installation, Administration and Maintenance EN - Manual (Page 38)

SIP – DECT OM System Manual Release 2.1 5 OMM Web Service
depl-1230/1.3 Page: 38 (196)
- “P-Asserted-Identity” - Default Value
- “From / To”.
• Multiple 180 Ringing : If this feature is deactivated, the OMM sends out only one 180
Ringing response for an incoming call if PRACK is not supported. If this feature is
activated, the OMM retransmits multiple times the 180 Ringing response for an incoming
call if PRACK is not supported. This ensures that the calling side receives a 180 response
in case of packet losses on the network. By default this feature is active.
• Blacklist time out : The amount of time in minutes an unreachable call server stays in the
blacklist. Valid values are 0 to 1440. Default is 5.
RTP settings
• RTP port base : Each RFP needs a continuous port area of 68 UDP ports for RTP voice
streaming. The RTP port base is the start port number of that area. Default is 16320.
• Preferred codec 1 – 5 : Specifies a customized codec preference list which allows you to
use the preferred codecs. The Codec 1 has the highest and Codec 5 the lowest priority.
• Preferred packet time (10 – 80 msec): Determines the length of voice samples collected
before sending out a new RTP packet. A small setting improves voice quality at the
expense of data transmission overhead. Valid values are 10 to 80 milliseconds. Default is
30.
• Silence suppression : Enables automatic silence detection in the RTP voice data stream
to optimize the data transfer volume.
• Receiver precedence on CODEC negotiation :
- The ON (option is enabled) setting means:
The CODEC selection for incoming SDP offers based on the own preference order list.
The first entry in the OMM preferred codec list matching an entry in the incoming SDP
offer will be selected.
- The OFF (option is disabled) setting means:
The CODEC selection based on the preference order list of incoming SDP offer. The
first entry in the incoming order list matching an entry of OMM preferred codec list will
be selected. This is the default and is as recommended in RFC 3264.
• Eliminate comfort noise packets : If this feature is activated then comfort noise packets
are removed from the RTP media stream which causes gaps in the sequence numbers.
This can be used if comfort noise packets e.g. in G.711 media streams disturb voice calls
in certain installations.
DTMF settings
• Out-of-Band : Used to configure whether DTMF Out-of-Band is preferred or not.
• Method : The OMM supports the following DTMF Out-of-Band methods:
- RFC 2833
Transmit DTMF as RTP events according to RFC 2833 (/14/) after the payload type
negotiation via SIP/SDP. If the payload type is not negotiated, “in band” will be used
automatically.
- INFO
The SIP INFO method is used to transmit DTMF tones as telephone events
(application/dftmf-relay). This setting should be used if RFC 2833 is not supported.