AASTRA SIP-DECT (Release 3.0)- OM System Manual - Installation, Administration and Maintenance EN - Manual (Page 52)

SIP–DECT OM System Manual Release 3.0 7 OMM Web Service
Aastra depl-1624/1.0 Page: 52 (241)
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Determine remote party by … header : The SIP header can be selected from which the
remote party information (user id and display name) should be determined. If P-Asserted-
Identity (default value) is selected, but no such header is received a fallback to the
mandatory From / To header will be done. This feature can be configured by choosing
one of the two values.
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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.
RTP settings
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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.
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Preferred codec 1 – 4 : Specifies a customized codec preference list which allows you to
use the preferred codecs. The Codec 1 has the highest and Codec 4 the lowest priority.
Note: With SIP–DECT Release 3.0 the voice codecs G.722 (wideband), G.711 u-law,
G.711 A-law and G.729 A are supported. The previously supported codec G.723 is
not available anymore.
The SIP–DECT license model includes a license for the G.729 codec. The
Licenses
Web page (see also chapter 7.10) provides information about how many G.729
channels are licensed and how many licenses are temporarily in use.
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Preferred packet time (10, 20 or 30 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.
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Silence suppression : Enables automatic silence detection in the RTP voice data stream
to optimize the data transfer volume.
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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.
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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
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Out-of-band : Used to configure whether DTMF Out-of-band is preferred or not.
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Method : The OMM supports the following DTMF Out-of-band methods: