Media5 Mediatrix 4104, Reference Manual

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Chapter 24 - Telephony Attributes Delayed Hot Line
326 Mediatrix 4104
4. Define the Hook Flash Processing as per “Hook Flash Processing” on page 322 .
Setting the telephonyAttributesHookFlashProcessing variable to outOfBandUsingRtp means the
following:
5. Set the behaviour for the support of RFC 2833 in the voiceIfDtmfEnforceDefaultEvents variable for
both units.
6. If applicable, configure port mapping as per “Source Line Selection” on page 223 .
You could map FXO ports to IP Phones or analog phones connected to FXS ports. This creates
transparent and user-friendly call scenarios, as IP endpoints can act as remote PBX extensions.
Thus the reach of a PBX can be extended beyond the physical location of the PBX. This is
especially an attractive option for SOHO users.
Delayed Hot Line
The delayed hot line feature is used to make an automatic call to a specified address on the two following
conditions:

When the user picks up the phone but does not dial any digit.

When the user starts dialing but does not complete a valid number before the timeout set in the
digitMapTimeoutCompletion variable expires. This is the delayed hotline extension feature.
This feature thus places an automatic call whenever the digitMapTimeoutFirstDigit timout expires. It could be
used as an alternative to the emergency number (for instance, the 911 number in North America).

To configure the basic delayed hot line feature:
1. Enable the delayed hot line feature by setting the telephonyAttributesDelayedHotLineEnable
variable to enable .
When the feature is disabled, a user picking up the phone but not pressing any telephone keys
hears the Receiver Off-Hook tone after the amount of time specified in the
digitMapTimeoutFirstDigit variable.
Table 215: Hook Flash Processing
Mediatrix 1204 Mediatrix FXS Device
The hook-flash event received via an RFC
2833 RTP packet is executed. The hook-flash event is relayed as telephone-
event 16 via an RFC 2833 RTP packet.
Table 216: DTMF Enforce Default Events
Parameter Description
enable Conformance is enforced and support for RFC 2833 implies the support of basic
telephony-events. When setting the variable
voiceIfDtmfTransport to
outOfBandUsingRtp ( “DTMF Transport Type” on page 235 ), or the variable
telephonyAttributesHookFlashProcessing to outOfBandUsingRtp ( “Hook Flash
Processing” on page 322 ), the unit will advertise the support for events 0-15; it will
assume support for events 0-15 when support for RFC 2833 is received in an
announcement.
disable This creates a deliberate deviance to RFC 2833 as support of basic events is not
automatic. The variables
voiceIfDtmfTransport and
telephonyAttributesHookFlashProcessing then act independently to specify which
events will be relayed via RFC 2833. If Hook Flash relay is enabled by itself, support
of event 16 alone will be advertised; if both Hook Flash and DTMF relay are
activated, events 0-16 are supported.