How to configure Dual server with SIP call?

Asterisk Asterisk General
1

i want make a call through server A to another client with dynamic IP registered in Server B.
how can i do that?

i had create the client in server B.
sip.conf (context:default )

	[gerson]
	disallow=all
	allow=ulaw
	allow=alaw
	type=friend
	username=gerson
	secret=gerson
	host=dynamic
	dtmmode=inband
	mailbox=2000
	context=default

then what i need to do in the extensions.conf?

2

voip-info.org/wiki-Asterisk±+dual+servers

3

i know this link is useful but it only shows the configuration of IAX only not SIP…
it says the SIP does not need any configuration… but now my SIP clients in differ Asterisk can’t ‘communicate’.

anyone know how to configure the dual server with SIP ? help…