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[serverA] type = peer host = 192.168.1.101 username = serverB secret = apples context = incoming disallow = all allow = ulaw
exten => _5XXX,1,Dial(SIP/${EXTEN}@serverA)
[serverB] type = peer host = 192.168.1.102 username = serverA secret = apples context = incoming disallow = all allow = ulaw
exten => _6XXX,1,Dial(SIP/${EXTEN}@serverB)