Hi, I read somewhere if you need an scalable Gateway for huge number of agent it is better to use SER ( OpenSER ) inside of your asterisk. My question is that is it really true ? and why ? Also is there any way to integrate SER with asterisk in this way that the SER itself won't route any calls to the SIP clients which register with their own custom numbers but check it with asterisk route rules and then route the calls. -- Regards Hamid Hashemi