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Page 40 - Line Functions The Configuration Tree Functions
The Voice over IP Tab
Gateway IP Address: Enter the IP address of the remote system.
Voice Pkt. Size: This is the number of data bytes contained in a Voice Packet.
Compression Mode: This defines the type of compression which is to be used
on any Voice call on this Line. Amongst the options available, the recommended
options are :-
Automatic Selection:
The most appropriate compression mode will be automatically selected for the
hardware (default setting)
G.711 ALAW 64K:
Each voice call is converted from analogue to digital and uncompressed at
64kbps.
G.729(a) 8K CS-ACELP:
A standard ITU-T coding algorithm used for speech compression. Reduces
voice to 8kbps, resulting in the bandwidth utilasion of 29.6kbps across the Lan
and 12.4kbps across the WAN.
G.723.1 6K3 MP-MLQ:
A standard ITU-T coding algorithm used for speech compression. Reduces
voice to 6.3kbps, resulting in the bandwidth utilasion of 20.8kbps across the
Lan and 9.333kbps across the WAN.
Gatekeeper Primary IP Address: For future use.
Gatekeeper Secondary IP Address: For future use.
H450 Support: Selects the supplementary service signalling method for use
across H232 connections. Options are None, Qsig or H450.Silence
Suppression: When selected, voice traffic will be automatically reduced during
pauses in conversation. This is useful when optimising data traffic across the
WAN.
Enable FastStart: A fast connect procedure. Reduces the number of messages
that need to be exchanged before audio channel is created.
Fax Transport Support: If selected this option will provide support for faxing
over a H.323 connection.
Local Hold Music: When selected H.323 terminals will, were applicable, use
their own hold music.
Local Tones: When selected H.323 terminals will use their own ringing tones.
Enable RSVP: For future use.
Out of Band DTMF: If selected DTMF will be suppressed and a message is sent
instead to create the DTMF at the remote end.
Allow Direct Media Lines: Not used.
Voice Networking: This option enables extension number sharing with the
remote system. Extensions on the remote system can then be dialled from the
local system. This requires that extension numbers and names on the two
systems are unique. Line and group extension numbers are not shared. Remote
extension numbers cannot be included in local groups.
Page 40 - The Configuration Tree Functions INDeX IPNC Cassette Administration Manual
Line Functions 38DHB0002UKDD – Issue 7 (22/11/02)