NEC Electra Elite IPK II System User Manual page 585

Electra Elite IPK II
In voice communication, particularly Internet telephony, the Mean Opinion Score (MOS) provides a
numerical measure of the quality of human speech at the circuit destination. The scheme uses
subjective tests (opinionated scores) that are mathematically averaged to obtain a quantitative indicator
of the system performance. The maximum MOS is 5.0.
IPK II SIP supports a 100 rel option and Session Timer option.
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IPK II SIP supports Early Media.
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IPK II SIP restricts an outgoing call under the following conditions:
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SIP configuration failed
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SIP registration failed
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CPUII and MG16 Link down
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Lack of MG16 DSP resource
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Lack of a MG16 bandwidth
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Both port numbers can be configured by system data.
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ToS Support.
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Conditions
SIP IP Station to MEGACO IP Station does not support Peer-to-Peer function and results in
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using a DSP resource. (Version 1600 and 2100 or higher required).
SIP Stations which support RFC 3842 (Message Waiting) receive Message Waiting Lamp
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indications. (Version 1600 and 2100 or higher required).
SIP Station – MG16 does not support NAT traversal.
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SIP Station – MG16 does not support a Blind Transfer feature.
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SIP station does not support Video Stream.
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SIP Station and SIP Trunk required license key for activation. Once activated, the SIP
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Client license may be shared between SIP Station and SIP Trunks.
The maximum number of the SIP clients is 256.
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SIP protocol (RFC3261) is used.
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SIP Station uses the MG16 as a media gateway. Any MG16 can be used as a MG. Master/
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Slave setting is not required.
Default UDP listen port for a SIP station is 5070. Both port numbers can be configured by
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system data.
IPK II SIP Station registration policy supports an authentication feature. Enabling this policy
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prevents the registered telephone from unexpected override.
IP Station (SIP) – MG16
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