Multi-Tech Systems MVP210/410/810 manual Advanced button, Alternate Routing Field Definitions

Chapter 5: Phonebook Configuration

Clicking on the Advanced button brings up the Alternate Routing secondary screen. This feature provides an alternate path for calls if the primary IP network cannot carry the traffic. Often in cases of failure, call traffic is temporarily diverted into the PSTN. However, this feature could also be used to divert traffic to a redundant (backup) unit in case one VOIP unit fails. The user must specify the IP address of the alternate route for each destination pattern entry in the Outbound Phonebook.

		Figure 5-3: Advanced button
		Alternate Routing Field Definitions
Field Name	Values	Description
Alternate IP	n.n.n.n	Alternate destination for outbound data traffic in case of excessive delay in data
Address		transmission.
Round Trip	Default is	The Round Trip Delay is the criterion for judging when a data pathway is
Delay	300	considered blocked. When the delay exceeds the threshold specified here, the
	milliseconds	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).

PSTN Failover Feature. The MultiVOIP can be programmed to divert calls to the PSTN temporarily in case the IP network fails. See Figure 5-4 below for example.

3.Call diverts to Alt IP address in voip accessing PSTN line.

PSTN Line

FXO

4.Call completed via PSTN.

VOIP	IP	VOIP
	NETWORK
FXS	2. IP network fails.
1. Call originates.

PBX

Figure 5-4: PSTN failover

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