Avaya Octel 200 Installation And Maintenance Manual page 878

15-2 Integration Volume
The process of handling an answered call is a more complex than is typical with most switches. When the
message server initiates a transfer and that transfer can be completed, a second channel connects the
caller to the called party. For a brief period, equivalent to how long it takes the called party to answer
after the telephone starts ringing, there are two ports involved in the transfer. When the called party
answers, the switch that originated the call tells the switch that answers the call to perform a task called
"route optimization." When this task is complete, both ports on the message server, seen as "transit
PBX", become free. There are sizing implications because all transferred calls have a time period
potentially equivalent to the duration of a supervised ring-no-answer call, which a single call takes up
two ports.
With the QSIG integration, the transfer and forward back scenario no longer applies. For example, when
the server extends a call through the QSIG switch and reaches a station that is busy, that busy condition is
reported through common channel signaling, the call remains on the port that answered originally, and
the caller is prompted as would be expected based on the configuration.
There are some configuration implications associated with the approach discussed above. It is still
necessary that user mailboxes be configured with Attributes 6 and 15. Attribute 6 allows transfer to an
extension when the mailbox greeting is on. Attribute 15 - Transfer to a Ringing Extension − has
traditionally been used to release the call from the port that has it unless the server detects a busy or fast
busy signal. Typically, that call would then forward back to another port. The alternative to releasing the
call is to supervise the transfer. Although in the CCS integrations the call is not actually released from
the port that answered it, Attribute 15 is still required to provide the functionality associated with an
unsupervised transfer. If Attribute 15 is not assigned, the caller will hear silence or music on hold, and
the called party will hear "tick...tick...tick...connecting."
Also note that it is not necessary to play the "A" tone for forwarded calls (controlled by System
Parameter 130). The "A" tone is used is some situations so that if a port initiates a call that is then
forwarded back to the server, the receiving port can be disconnected. Because the "forward back"
scenario does not apply, the "A" tone is not needed.
OUTCALL IN A CCS ENVIRONMENT
Outcall functions for message servers integrated using common channel signaling (DPNSS, ISDN, and
QSIG) operate differently than in other integrations. Differences include:
The F, E, and N characters used in off-site, alarm and/or network outcalls do not pertain in these
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environments. Including an F or an N in an outdial string will cause the outcall to fail. The E is
ignored. Valid digits in an outdial string of any kind include 1-9, * , #, and D. The characters P and
T are supported for network outdial strings and can be inserted anywhere.
The first D character in the outdial string is seen by the system as a delimiter. Any characters
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specified prior to that first D are outdialed immediately. Characters after the first D are sent only
after the connect message has been received by the CPU. The delimiter D and any subsequent Ds
will introduce a delay in the outdial sequence; the length of the delay is based on the value of System
Parameter 28.
There is a difference in how the message server handles situations where the server (1) reconnects to
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a call after detecting a no-answer condition or (2) initiates a call and disconnects after detecting a
no-answer condition. In traditional integrations, Information Table Indexes 7 and 8 are used to
define how many rings indicate no-answer. With common channel signalling, a ring-no-answer is
defined either by a negative acknowledgment from the PBX or by a time-out waiting for
acknowledgment. The value of the time-out is determined as follows:
Octel 200/300 S.4.1 PB60019-01