Hi, Im trying to figure out what the network topology should be for my SIP network. What I want to do is basically to divide my users into 3 subnets and assign a SER proxy with a public ip for each subnet. The domain should be the same for all users ie sip,otenet-telecom.com and every time a user would send a register message the dns resolution would point him to the proxy that I chose to serve the users of the subnet the user to be registered belongs to.

Can this be done or will I need to define separate domains ie sip1.otenet-telecom.com for the first subnet sip2.otenet-telecom.com for the second subnet etc...