Intercluster Lookup Service vs Service Advertisement Framework

[mclean.danny]

Hi experts,

I am looking to tie in a few clusters so they can dial each other with their respective 4 digit dialing plans (non overlapping). They are all on ver 10.5 and 11.5. It looks like ILS is easier and wouldn't require config on routers. We have a private WAN connection between them with dynamic routing. What would be the best solution for this that can also leverage AAR as a backup call plan?

[Jonathan Unger · Accepted solution]

ILS/GDPR (Global Dial Plan Replication) is superior in my opinion for several reasons:

• Easier to configure / Less complex
• Scales much larger (can replicate a huge number of call routing elements)
• Supports URIs
• Can advertise individual DNs very easily (tickbox)
• Can break down learned patterns into more granular partitions
• Does not rely on SAF forwarders

AAR will only be invoked when EL-CAC determines there is a lack of bandwidth for a call. PSTN failover is a separate function from AAR in the cases of SAF/CCD and ILS/GDPR. ILS/GDPR does have a PSTN failover mechanism which optionally can use digit stripping and prefixing.

There is a great section on GDPR in the SRND here
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab10/collab10/dialplan.html#17464

Does that answer your question?

[mclean.danny]

Hi Jonathan,

Thanks for taking the time to answer this. Yes, this is great information. Still haven't had a chance to roll this out. Client is dragging their feet.