
V6100 and V7122 User Guide
249
PSTN Fallback as a Special Case of Alternative Routing
The purpose of the PSTN Fallback feature is to enable the V7122 gateway to redirect PSTN
originated calls back to the legacy PSTN network if a destination IP route is found unsuitable
(disallowed) for voice traffic at a specific time.
To enable PSTN fallback, assign the IP address of the gateway itself as an alternative route
to the desired prefixes. Note that calls (now referred to as IP to Tel calls) can be re-routed to
a specific trunk group using the Routing parameters.
Relevant Parameters
The following parameters (described in
Table 51
) are used to configure the Alternative
Routing mechanism:
AltRoutingTel2IPEnable
AltRoutingTel2IPMode
IPConnQoSMaxAllowedPL
IPConnQoSMaxAllowedDelay
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’). The destination IP address for CDR logs
is determined by the parameter ‘CDRSyslogServerIP’.
The following CDR fields are supported:
Table 57
Supported CDR Fields
Field Name
Description
Cid
Board’s Logic Channel Number
CallId H.323/SIP
Call Identifier
Trunk
Physical Trunk Number
BChan Selected
B-Channel
ConId
H.323/SIP Conference ID
TG
Trunk Group Number
EPTyp Endpoint
Type
Orig
Call Originator (IP, Tel)
SourceIp
Source IP Address
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