Call routing
186
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
6. 3. 6 Response if unobtainable
Various redirection destinations can be configured for each user so that ideally no calls
are left to idle for whatever technical reasons. The call is then redirected depending on
why the terminal is unobtainable and the call’s origin (internal/external). A user is con-
sidered to be unobtainable only if none of his allocated terminals can be reached. Pos-
sible redirection destinations include internal and external users, PISN users, abbrevi-
ated dialling numbers, user groups, call distribution elements, etc.
There are three categories of reasons why a terminal may be unobtainable:
Category 1: Terminal not running or out of DECT coverage range
• A desk phone is not connected
• A cordless phone
– is outside the coverage range
– is switched off or its battery is empty
– is not logged on
• A softphone (IP terminal) is not started up or not connected to the IP network
Note:
Analogue terminals that are not connected cannot be detected.
Examples of sensible redirection destinations:
User’s voice mailbox, switching centre.
Category 2: No VoIP channel available at present
An IP terminal or a user on a different node in an AIN cannot be reached momentarily
because
• the configured bandwidth between the nodes in accordance with the bandwidth
model is being used to capacity.
• all VoIP channels of the DSP chips are occupied.
• the licence limit for the number of simultaneously active VoIP channels has been
reached.
Examples of sensible redirection destinations:
User’s external call number, user’s mobile call number, general voice mailbox, switch-
ing centre.
Note:
If PSTN overflow is enabled and configured in the AIN, an attempt will first be made to route the
call via the PSTN.
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