User`s manual

H.323 User's Manual 8. Telephony Capabilities
Version 5.0 269 December 2006
8.10 Mapping PSTN Release Cause to H.323 Response
The Mediant 1000 FXO module is used to interoperate between the H.323 network and the
PSTN/PBX. This interoperability includes the mapping of PSTN/PBX Call Progress Tones
to H.323 Release Causes for IPÆTel calls. The converse is also true: For TelÆIP calls, the
H.323 Release Causes are mapped to tones played to the PSTN/PBX.
When establishing an IPÆTel call the following rules are applied:
If the remote party (PSTN/PBX) is busy and the FXO module detects a Busy tone, it sends
a Release Cause with User Busy (17) to IP. If it detects a Reorder tone, it sends a Release
Cause with No Route to Destination (3) to IP. In both cases the call is released. Note that if
‘DisconnectOnBusyTone = 0’ the FXO module ignores the detection of Busy/Reorder tones
and doesn’t release the call.
For all other Mediant 1000 FXO release types (caused when there are no free channels in
the specific hunt group, or when an appropriate rule for routing the call to a hunt group
doesn’t exist), the Mediant 1000 sends H.323 response (to IP) according to the parameter
‘DefaultReleaseCause’. This parameter defines Q.931 release causes. Its default value is
‘3’, which is mapped to H.323 Release Cause with No Route to Destination. By changing
its value to ‘34’ No Circuit Available response is sent. Other causes can be used as well.
8.11 Call Detail Report
The Call Detail Report (CDR) contains vital statistic information on calls made by the
gateway. CDRs are generated at the end and (optionally) at the beginning of each call
(determined by the parameter ‘CDRReportLevel’) and sent to a Syslog server. The
destination IP address for CDR logs is determined by the parameter ‘CDRSyslogServerIP’.
Table 8-1 lists the CDR fields that are supported.