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too many sessions on ASA firewall from ip phones to CUCM

We have several ip phones at WAN side . These phones connected to CUCM using VPN lines . There is an ASA firewall between phones and servers . A few days ago we saw that one of the brunch is using ASA's 75% of capacity .Most probably it was an attack (we couldn't check the traffic details because our technician has been changed it with spare firewall ). how can we prevent our CUCM networks this kind of attacks  ? .We are planning to make limitation  of connections for every brunch on firewall. There can be special configuration example or an advice better than this .

I am waiting an advice from you ..