Example MP11x FXO Setup Guide v1.6
Last Updated: 6/11/18
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13
b. To indicate that a phone call has ended the far end may indicate this by one of several
different methods. These are only indications and cannot actually do anything. A chosen
method must be supported by both ends to work!
DTMF Event (button pressed)
Reorder / Dial Tone
SIT (Special Information Tone) Tone (3 rising tones followed by an error)
Off-Hook
“Howler” Tone (loud 0.1s ON / 0.1s OFF tone)
Polarity Reversal / Current Disconnect
c. Additionally, the following can also be used by the SIP FXO side (near end) to
additionally detect a dead call:
RTP stream interruption
Silence detection
d. The Commend SIP Devices or Server also require some kind of call progress indication.
SIP supports signaling during the call to indicate call progress. However, when
connecting SIP to the analog telephone side this issue must be considered with one of
the above methods.
e. The above issue can cause the
Audiocodes device to not hang up automatically
after
the call has ended on the analog telephone side. If the Audiocodes device still believes
the call to be activate then it will not in turn send a SIP BYE to cause the SIP side to hang
up either. Therefore, the SIP Device or Server still shows the call as active.
f.
In the Search field enter the terms
DisconnectOnBusyTone, DisconnectOnDialTone
,
EnableCurrentDisconnect
, and
EnableReversalPolarity
to find the relevant settings.
g. Try loading country specific or custom dial tone files. This is found under
Maintenance
>
Software Update
>
Load Auxiliary Files
>
Call Progress Tones
.
h. As a backup Silence Detection may also be used. If both ends are silent for a definable
amount of time the call can also be disconnected automatically. In the Search field enter
the terms
EnableSilenceDisconnect
and
FarEndDisconnectSilencePeriod
.
i.
These settings are described in more detail in the Audiocodes MP-11x Manual under
section
26.14.3.1 Calls Termination by PBX
.
19. Voicemail Detection
a. As mentioned in Section
18. On-Hook Detection (Call End)
there is no way to detect
Voicemail as there is no ability for the antiquated telephone system to send Call
Progress.
b. As a work around the following may be helpful. The greeting on the phone is re-recorded
to start with a DTMF event (button 2) sound. This triggers the Audiocodes device to
disconnect and consider it a failed attempt. The SIP Intercom device is given call
progress and will initiate another call attempt to the next number as programmed.
Commend SIP Intercom programmed with Phonebook Sequence:
o
Line Row 1:
a. Call:
b. Wait = 30s
o
Line Row 2:
a. Call:
