Hello, I have the following scenario: Main_Asterisk_Server <----IAX----> Client_Asterisk_Server <----> Client_SIP_Stations Basically, I have a master * server and I'm offering telephony services to a client of mine. However, even though my client has 10 SIP stations, they only want to pay for 4 telephone lines. How can I configure the Asterisk servers so that if 4 SIP stations are on the line, if the 5th one tries to make a call, he/she would get Congestion. Also, if 4 of their SIP stations are on the line and a 5th incoming line gets to the Main_Asterisk_Server, it should play a Busy tone and hang up. I know I could create a group of channels in my T1s in Main_Asterisk_Server and whatever the size of that group is (e.g. 4), that will restrict the client. However, given that I have many clients with a similar server, I don't want to "dedicate" the channels on my T1s to these clients. I just want to have a pool of channels from all my T1s available to all my clients and restrict channel usage in some other way. Did I make any sense? Hope you understood what I'm asking for. Thanks, Daniel