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T1 Phonebook Configuration MultiVOIP User Guide
330
Alternate Routing Field Definitions
Field
Name
Values Description
Alternate
IP
Address
n.n.n.n
where
n= 0-255
Alternate destination for outbound data traffic
in case of excessive delay in data transmission.
Round
Trip
Delay
milliseconds The Round Trip Delay is the criterion for
judging when a data pathway is considered
blocked. When the delay exceeds the
threshold specified here, the data stream will
be diverted to the alternate destination
specified as the Alternate IP Address.
The Alternate Routing function facilitates PSTN Failover protection, that is, it allows
you to re-route voip calls automatically over the PSTN if the voip system fails. The
MultiVOIP can be programmed to respond to excessive delays in the transmission of
voice packets, which the MultiVOIP interprets as a failure of the IP network. Upon
detecting an excessive delay in transmission of voice packets (overly high “latency”
in the network) the MultiVOIP diverts the call to another IP address, which itself is
connected to the PSTN (for example, via an FXO port on the self-same MultiVOIP
could be connected to the PSTN).
IP
NETWORK
FXS
FXO
VOIP
VOIP
PBX
PSTN Line
1. Call originates.
2. IP network fails.
3. Call diverts to
Alt IP address in voip
accessing PSTN line.
4. Call completed
via PSTN.
PSTN Failover Feature. The MultiVOIP can be programmed to divert calls to the
PSTN temporarily in case the IP network fails.