Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Call Forward Hops limitation

Hi,

I've the following scenario: 2 CCM clusters connected via an Intercluster Trunk not GK controlled.

One Cluster is versione 3.3 and the other 7.1.

For IP extensions migration reason I need to have a RP XXXX pointing from one cluster to the other, because extensions still on the old cluster needs to be able to call extensions on the newer one. BUT this create calls loop IF an IP phone registered on the old cluster calls an unregistered ip phone. The call started to bounce from the old cluster to the new (where unregistered phone are forwarded to the old cluster) and this is the problem.

I was looking for a way to limit this scenario; I tried block offnet to offnet calls but it doesn't work. Do you have any suggestions (maybe limiting the maximum forwarding hops?)?

Thanks

Best Regards

Roberto

2 REPLIES
Cisco Employee

Re: Call Forward Hops limitation

The hop counter does not help here because each call that comes and goes has different ID. Only if you were doing the calls within phones in the same cluster it would work.

You need to modify the CSS on one of the clusters so they cannot reach them if unregistered to avoid the loops.

Block Offnet to offnet is for transfers, not for CF

HTH

java

if this helps, please rate

HTH

java

if this helps, please rate

www.cisco.com/go/pdi
New Member

Re: Call Forward Hops limitation

Hi,

ok this helps for the unregistered phones, thanks.

But I still have the problem if a phone on the old cluster calls a not existing extension in the IP Phones numbering plan. In this case it matches the XXXX RP, goes to the newer CUCM (where the extension doesn't exist), matches the XXXX RP, then went back to old CCM and so on.

Thanks

Best Regards

Roberto

136
Views
0
Helpful
2
Replies