Section 25: ISDN Tab
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Page 245
T E C H N O L O G Y
If you are using your codec in other places where MSN numbers (Multiple
Subscriber Numbers) are used, enter the MSN number in the
DN1
and
DN2
fields within your codec or
Tool
Box.
25.8.
Auto answer
When checked, the codec will automatically answer incoming calls. If unchecked,
upon receiving an ISDN ring, the codec makes periodic beeps and the user must
press the
ANSWER
or
HANGUP
buttons on the keypad of the codec.
A Cautionary Note:
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ieline
codecs react to ISDN incoming calls only if it is in
ISDN operation mode.
25.9.
Phantom Power Detect
Some ISDN lines have phantom power on them. When checked, the codec will
detect phantom power when using ISDN lines. This is useful in the detection of
lost connections. If there is phantom power on the ISDN line and it suddenly
disappears at the codec, the codec will display a
Disconnect
message. This will
indicate a lost connection and assist in tracing the fault.
25.10.
Manual Default Algorithm
The
Manual Default Algorithm
setting in the
ISDN
menu relates to the
Manual
Default Profiles
within
Tool
Box.
The setting you choose here will relate to any
Manual Default Profiles
that utilize ISDN connections. For example, if you select
G.722
from the drop-down menu, any manual default profile using an ISDN
connection will be programmed to use the G.722 algorithm.
25.11.
Samplerate
If you select one of the MPEG algorithms you
can also select the sample rate you wish to
use from the four available options. The
Samplerate
setting is for all manual default
profiles and will also be used by custom
profiles with connections that use the
Any
setting within the
Algorithm
drop-down menu
in the
Connection Setup
tab.
The sample rate you select will be dependent on the connection or connections
you are using. For example, if you have only one 64k ISDN B channel available
you will not be able to use a stereo algorithm with a sample rate of 48,000bps. If
you do connect at this
Samplerate
the quality will not be very good. The
recommended maximum you should set it at is 32,000bps for this type of
connection. The default
Samplerate
for MP2 algorithms is 32,000 bps.
