Instruction manual

Menus and Parameters
2-107
BreezeACCESS Version 4.5 System Manual
Available selections:
" Speech (used by H.323 speech terminals)
" Unrestricted (used by H.323 AudioVisual terminals for
unrestricted digital information)
" Restricted (used H.323 AudioVisual terminals for restricted
digital information)
" 3.1 kHz audio (used by H.323 speech terminals)
" Unrestricted with tones (used by H.323 AudioVisual terminals
for transmission of unrestricted digital information with
tones/announcement)
" Video (not used by H.323 terminals)
The default is Speech.
! DTMF Relay – Selects the method of handling DTMF signals. DTMF
input may be transferred through a network in-band by RTP
payloads, or using DTMF relay. The use of DTMF relay is preferred
as it overcomes the problems of RTP packet loss and jitter. When
DTMF relay is used, DTMF digits are transferred using H.245
protocol messages (standard), or Q.931 protocol message
(proprietary). The DTMF relay can handle all phone-pad digits (0-9,
A-D, *, #) and Hook-Flash (!).
The following options are available:
" Disable – DTMF tones are transferred in band (through the voice
codec using the RTP protocol)
" Enable – DTMF signals are relayed via H.245 sessions. If Fast
Start is enabled, a H.245 session will be forced upon detecting
DTMF signals.
" Enable Proprietary – If Fast Start is enabled, DTMF signal will
be relayed via Q.931 sessions. If Fast Start is disabled, DTMF
signal will be relayed via H.245 sessions.
The default selection is Enable.
! Endpoint Type – Defines the EndpointType components in H.323
messages for interoperability with other equipment using H.323.
Available options are Terminal, Gateway.
The default is Terminal
! Fax Relay – Defines the use of T.38 protocol for relaying fax
messages. T.38 is a protocol dedicated to fax. When the Fax Relay
Option is enabled, fax signals are demodulated at the voice/fax
NOTE:
This information element is encoded according to Figure 4-11/Q.931 and Table
4-6/Q.931. The SU support only H323 Speech traffic and a change of the default
value is not recommended. A change will be needed only as result of special PSTN
switch requirements.