Talkswitch 48-CVA - Manual (Page 86)

Maximum time: The default setting of 65ms should be adequate for most
environments. In most problem cases, this value only needs to be bumped up a
bit to help the system deal with echoed digits seen from cell phones. For example:
calls keep being misdirected to extension 111. This usually indicates that even
though the caller may have dialed 113, TalkSwitch sees 1113 because the ‘1’ was
echoed by the cell phone network. Once TalkSwitch captures 3 digits, it will
ignore the rest, hence the digits ‘111’ will be accepted and the ‘3’ ignored.
Line CPC/ Disconnect Clear:
If calls are being disconnected accidentally in mid conversation, this usually
indicates a problem with the telephone line. TalkSwitch is always looking for a
‘hangup’ signal from the phone company called a CPC or Disconnect Clear
signal. If the line has ‘shorts’ or the line card at the central office is defective, then
CPC signals in the 250ms range might come down the line and cause TalkSwitch
to hangup. Try bumping up this value if this seems to be occurring.
Ringback Control:
If an extension seems to ring back as if a caller was on hold, but when answered,
no one is there, this could indicate a debounce problem with the phone
hookswitch. When someone at the extension hangs up, the handset bounces
slightly to cause a flash signal to be seen by TalkSwitch before the hang up. As a
result TalkSwitch puts the line on hold. To help with this problem, this value can
be increased to the point where it will stop the ringbacks.
Line Impedance:
Typically, most phone companies in North America have a terminating line
impedance of 900 ohms + 2uF. In some cases, it may be 900 ohms. If TalkSwitch
is being connected behind another phone system or gateway, then you may need
to select 600 ohms. If the incorrect value is chosen, the system will still operate,
but it may cause echo during conversations.
Fax Detection:
If fax calls are not being directed properly to the fax machine, then you may need
to set this option to detect 1 tone. If it’s set to detect 1 tone and people complain
they have been accidentally routed to the fax machine, then set this value to
detect 2 tones.
VoIP Ports:
The default SIP signalling port is 5060. If you need to choose another port, then
enter a value between 1024 and 16556.
The starting RTP port for TalkSwitch is 6000. From this starting point, TalkSwitch
needs 4 ports for each TalkSwitch unit. RTP ports are even numbered from the
start port. ie. 6000, 6002, 6004 and 6006 are needed for the first TalkSwitch unit
on a LAN and 6024, 6026, 6028 and 6030 would be used for the fourth unit.
76 TalkSwitch User Manual
Networked
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