Hi, I've moved this discussion to users as it seems my query is moving in that direction :) So, upon looking at limit_hash, it appears to do what I need to do. My question then becomes, how do I set a hash for an originated call? It seems that limit_hash is an application rather than a channel variable, and so far I've been doing most things without touching the dialplan. So, say I want to originate 9 calls, 3 from 3 customers. I would like to mark the calls with my_customer_group_1 through 3, and then use the limit_hash_usage command to verify the count of channels in each group. I therefore have a few questions: 1. Can I mark a call in the originate statement? 2. How do I use the limit_hash_usage command? The wiki states: You can verify the usage of any resource with the limit_hash_usage api call. limit_hash_usage <realm> <id> Is realm the same as a SIP realm? Is id the hash that I have used to mark the call with? Just making sure :) -- Cheers, Matt Riddell Director