Samsung Ubigate iBG3026, Руководство по настройке

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CHAPTER 26. Voice Feature
318
© SAMSUNG Electronics Co., Ltd.
FAX Pass-through
The Ubigate iBG3026 system does not distinguish a fax call from a voice call.
Fax communication between the two fax machines is carried in its entirety in-
band over a voice call.
Fax up-speed is similar to pass-through in the sense that the fax call is carried
in-band over the voice call.
The difference is that when using up-speed, the Ubigate iBG3026 system is to
some extent aware of the fax call. Although relay mechanisms are not
employed, with up-speed the gateways do recognize a CED fax tone and
automatically change the voice codec to G.711 if necessary and turn off echo
cancellation(EC) and voice activity detection(VAD) for the duration of the call.
DTMF Relay
The reliable DTMF relay feature provides reliable digit relay between Ubigate
iBG3026 systems or between Ubigate iBG3026 system and Call Manager
when a low-bandwidth codec is used.
RFC2833
The Ubigate iBG3026 system support RFC 2833 for reliable DTMF relay.
The Ubigate iBG3026 system to relay DTMF tones provides a standardized
means of transporting DTMF tones in Real-Time Transport Protocol(RTP)
packets according to section 3 of RFC 2833.
DTMF events through SIP signaling
The Ubigate iBG3026 system support NOTIFY method for DTMF relay.
The SIP event notification mechanism uses NOTIFY method to signal when
certain telephony events take place. In order to send DTMF signals through
NOTIFY method, the gateway notifies the subscriber when DTMF digits are
signaled by the originator. The notification contains a message body with a
SIP response status line.
Ad-hoc Conference
Ad-hoc conferencing function provides the conferencing resource of DSP
contained in a Ubigate iBG3026, to provide high voice quality for the
supplementary services such as 3-way conferencing of Call Manager.
For Ad-hoc conferencing, a Ubigate iBG3026 interworks with Call Manager
using SIP, and the service is controlled by Call Manager.