Version 7.2 1131 Mediant 1000B Gateway & E-SBC
User's Manual 62. Configuration Parameters Reference
Parameter Description
Note:
 The parameter is applicable only for Tel-to-IP calls.
 This timeout is calculated from the end of the ring until the
start of the next ring. For example, if the ring cycle is two
seconds on and four seconds off, the timeout value should
be configured to five seconds (i.e., greater than the off
time, e.g., four).
Rings before Detecting Caller ID
configure voip > gateway analog fxo-
setting > rings-b4-det-callerid
[RingsBeforeCallerID]
Determines the number of rings before the device starts
detecting Caller ID.
 [0] 0 = Before first ring.
 [1] 1 = (Default) After first ring.

2 = After second ring.
Guard Time Between Calls
configure voip > gateway analog fxo-
setting > guard-time-btwn-calls
[GuardTimeBetweenCalls]
Defines the time interval (in seconds) after a call has ended
and a new call can be accepted for IP-to-Tel (FXO) calls.
The valid range is 0 to 10. The default is 1.
Note: Occasionally, after a call ends and on-hook is applied, a
delay is required before placing a new call (and performing off-
hook). This is necessary to prevent incorrect hook-flash
detection or other glare phenomena.
FXO Double Answer
configure voip > gateway analog fxo-
setting > fxo-dbl-ans
[EnableFXODoubleAnswer]
Global parameter enabling the FXO Double Answer feature,
which rejects (disconnects) incoming Tel-to-
signals (informs) this call denial to the PSTN..
You can also configure the functionality per specific calls,
using Tel Profiles (TelProfile_EnableFXODoubleAnswer). For
a detailed description of the parameter and for configuring the
functionality in the Tel Profiles table, see ''Configuring Tel
Profiles'' on page 428.
Note: If the functionality is configured for a specific Tel Profile,
the settings of the global parameter is ignored for calls
associated with the Tel Profile.
FXO Ring Timeout
configure voip > gateway analog fxo-
setting > fxo-ring-timeout
[FXORingTimeout]
Defines the delay (in msec) before the device generates a SIP
INVITE (call) to the IP side upon detection of a RING_START
event from the Tel (FXO) side. This occurs instead of waiting
for a RING_END event.
This feature is useful for telephony services that employ
constant ringing (i.e., no RING_END is sent). For example,
Ringdown circuit is a service that sends a constant ringing
current over the line, instead of cadence-
second off. For example, when a telephone goes off-hook, a
phone at the other end instantly rings.
If a RING_END event is received before the timeout expires,
the device does not initiate a call and ignores the detected
ring. The device ignores RING_END events detected after the
timeout expires.
The valid value range is 0 to 50 (msec), in steps of 100-msec.
For example, a value of 50 represents 5 sec. The default value
is 0 (i.e., standard ring operation - the FXO interface sends an
INVITE upon receipt of the RING_END event).
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