Samsung Ubigate iBG3026, Configuration Manual

Page: 359 / 718

Ubigate iBG3026 Configuration Guide/Ed.00
© SAMSUNG Electronics Co., Ltd.
317
The Ubigate iBG3026 system provides Call Admission Control based on
memory utilization. The Call Admission Control Based on Memory
Utilization feature permits the Ubigate iBG3026 system to deny incoming
calls exceeding a preconfigured threshold, permitting the selection of a system
memory load level value. This feature helps ensure the quality of service of
existing calls and reliability of system processes by preventing system
overload caused by excessive incoming calls. The feature rejects new calls,
with minor disruption to system users. The administrator of the Ubigate
iBG3026 system sets a threshold at which denial of new calls occurs.
This memory load threshold may be set anywhere from 20 to 90%.
The Ubigate iBG3026 system provides Call Admission Control based on DSP
utilization. The Call Admission Control Based on DSP channel Utilization
feature permits the Ubigate iBG3026 system to deny incoming calls exceeding
a preconfigured threshold, permitting the selection of a system DSP channel
load level value. This feature helps ensure the quality of service of existing
calls and reliability of system processes by preventing system overload caused
by excessive incoming calls. The feature rejects new calls, with minor
disruption to system users. The administrator of the Ubigate iBG3026 system
sets a threshold at which denial of new calls occurs. This DSP load threshold
may be set anywhere from 20 to 100%.
Voice Services
FAX
Ubigate iBG3026 supports FAX pass-through and SIP/H.323 T.38 FAX relay.
T.38
The Ubigate iBG3026 system negotiates fax relay transmission by exchanging
capability information in Session Description Protocol(SDP) messages and
H.323 messages.
T.38 Annex D procedures are used for the changeover from VoIP to fax mode
during a call.
For SIP, initially a normal VoIP call is established using SIP INVITEs.
The DSP of the Ubigate iBG3026 system needs to be informed that it can
support T.38 mode while it is put into voice mode. Then, during the call, when
the DSP of the Ubigate iBG3026 system detects fax flags, the Ubigate
iBG3026 system initiates a SIP INVITE mid-call to signal the desire to change
the media stream.