[cisco-voip] VoIP Failover Path

[Paul Choi]

On this topic, is it possible to have failover for PRI
to PRI over the WAN?

I have three offices each that can call each other
over their T1 circuits, each with their own dedicated
PRI. In the event that one of the PRIs fails, can I
route calls over the other two PRI circuits through
the WAN for failover?

These offices are all using CCME4.1.

Paul


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

> 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
> 
> 	
> 	## Scanned by Delphi Technology, Inc. ## 
> 
> 	
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