Version 5.8
391
September 2009
SIP User's Manual
9. IP Telephony Capabilities
Table notes:
For all other cases, a SIP 484 response is sent.
KP is for *.
ST is for #.
STP is for B.
The MF duration of all digits, except for the KP digit is 60 msec. The MF duration of the KP
digit is 120 msec. The gap duration is 60 msec between any two MF digits.
Notes:
•
Manipulation rules can be configured for the calling (ANI) and called
number (but not on the "display" string), for example, to strip 00 from the
ANI "00INXXYYYY".
•
The called number, received as userpart of the Request URI ("301" in the
example below), can be used to route incoming SIP calls to FXO specific
ports, using the TrunkGroup and PSTNPrefix parameters.
•
When the PSAP party off-hooks and then immediately on-hooks (i.e., the
device detects wink), the device releases the call sending SIP response
"403 Forbidden" and the release reason 21 (i.e., call rejected) "Reason:
Q.850 ;cause=21" is sent. Using the cause mapping parameter, it is
possible to change the 403 to any other SIP reason, for example, to 603.
•
Sometimes a wink signal sent immediately after the FXO device seizes
the line is not detected. To overcome this problem, configure the
parameter TimeToSampleAnalogLineVoltage to 100 (instead of 1000
msec, which is the default value). The wink is then detected only after this
t 50 msec (minimum 150 msec).
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