[cisco-voip] Call Routing (Loop)

[Scott Voll]

I don't think I follow all of scenario 2 but as for #1 we had the same thing
with our old PBX and our CM.  if the extension wasn't on either system you
would loop until all channels were in use or someone disconnected.  I think
the only fix would be to have a RP with all the extensions not in use
forwarded to an AA.  But every time you move an extension over you will need
to delete the RP extension.  If you were doing a trunk and not a channel
based circuit to the other PBX you have the ability to kill the system
because it will keep looping until the system can't take it any more.
Scott

On Tue, Jun 30, 2009 at 12:47 PM, <steve.siltman at assurant.com> wrote:

>
> Here is a couple of scenarios that I need help with.
>
> Scenario 1:
> Cisco IP Phones and Avaya phones mixed at the same location.  MGCP router
> is the go-between.  If an extension is dialed and doesn't live on one
> system, it forwards the call to the other system.  This works great.  What
> if the extension doesn't live on either system?  I was taking a trace from
> Call Manager, on a different issue, and noticed a problem that looks like a
> call is doing the above.  Without adding specific route patterns and
> continuing to use a large 1XXXX pattern to send calls across to Avaya when
> they don't exist on Call Manager, can I limit this route loop or stop it
> from happening somehow?
>
> Scenario 2:
> This one has me perplexed because I'm not sure why I didn't notice this
> long ago or how it continues to loop.  The call comes into a remote H.323
> gateway and the DNIS is translated into a DN that lives on Call Manager.
>  The dial-peer looks up the DN on Call Manager but it doesn't exist. *sigh*
>  We have a route pattern configured to point all those extensions towards
> the remote H.323 gateway.  I believe the first office was setup this way and
> its been copied for each additional remote office install.  We now have 20
> offices that have a route pattern pointing the Internal DN range back out to
> the remote H.323 gateway where the phones live physically.  I believe the
> resolution to this is to remove these internal DN range route patterns.
>  Call Manager already knows them and doesn't need this route pattern.
>  Correct?   I still don't understand how this could be looping but it must
> be looping within the Call Managers.  I turned on ISDN Q931 and VOIP
> DIALPEER debugs on the router and saw the call come in and hit the dial-peer
> to Call Manager.  Thats all I saw on the router but yet the Call Manager had
> 250 trace files, each 1 meg in size and rolled after 9 minutes.  Digit
> analysis shows the called number and the extension, that doesn't exist, over
> and over and over in just under 1 second intervals.  I'm pretty sure
> removing this internal DN range route pattern will resolve this but I'd like
> to know how its looping.
>
> Any suggestions or you've seen this before would be appreciated.  Thanks!
>
> Steve Siltman
> Assurant Corporate Technology
> steve.siltman at assurant.com
>
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