[cisco-voip] VoIP Failover Path

[Todd Simons]

Thanks!

I know about additional dial-peers, unfortunately you can only have one
session target per dial peer.

 

 I found this about PSTN Fallback:

http://www.cisco.com/en/US/docs/ios/12_2/12_2x/12_2xa/feature/guide/ft_p
stn.html

 

The PSTN Fallback feature and enhancement provide the following
benefits: 

*Automatically routes a call to an alternate destination when the data
network is congested at the time of the call setup. 

*Enables the service provider to give a reasonable guarantee about the
quality of the conversation to its Voice over IP (VoIP) users at the
time of call admission. 

*Provides delay, jitter, and packet loss information for the configured
IP addresses. 

*Caches call values from previous calls. New calls do not have to wait
for probe results before they are admitted. 

*Enables a user-configurable cause code display that indicates the type
of call rejection. 

 

The PSTN Fallback feature has the following restrictions: 

*When detecting network congestion, the PSTN fallback feature does
nothing to the existing call. It affects only subsequent calls. 

*Only a single ICPIF/delay-loss value is allowed per system. 

*A small additional call setup delay can be expected for the first call
to a new IP destination. 

*PSTN fallback is supported for H.323 VoIP calls only.

 

 

 

From: Alex [mailto:ecralar at hotmail.com] 
Sent: Wednesday, February 27, 2008 11:32 AM
To: Todd Simons; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] VoIP Failover Path

 

My memory can be rusty but I think you can do think using link-endpoint
addresses as "session targets", also look into "PSTN fallback" for
failover on bad quality.

Rgds

Alex

	----- Original Message ----- 

	From: Todd Simons <mailto:tsimons at delphi-tech.com>  

	To: cisco-voip at puck.nether.net 

	Sent: Wednesday, February 27, 2008 3:36 PM

	Subject: [cisco-voip] VoIP Failover Path

	 

	All-

	We have two Cisco2801 routers that can connect to each other
serial to serial, or Ethernet to Ethernet:

	 

	  /--S0--{path1}--S0--\

	GW1                   GW2

	  \--E0--{path2}--E0--/  

	 

	Currently PATH1 is our default path.  How can we setup PATH2 for
a backup path for VoIP dialpeers?  I've investigated the preference
value, but with the preference, what triggers the failover?  

	 

	Will/Can active Calls be passed between PATH1 and PATH2 without
dropping if PATH1 goes down?  

	 

	If call quality on PATH1 is bad, will PATH2 be used, will/can
active calls be moved??

	 

	Thanks!

	~Todd

	
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