Help-sip router problem

In our company we are using asterisk(trixbox) but now we bought 4 routers

so now the network is splitted sip protocol is not registering among the network i.e now the client on one router is not registering in asterisk server
how solve this problem. is there any file to edit.please help me i am a student.

You say you bought 4 routers, what do you mean by that? If you mean you bought four NAT type routers and you are using them all in the same building, you are doing that very very wrong…

explain the topology of your network (how it’s laid out) and more info will be provided…