do you mean using asterisk as a client (similar as ATA) to register to
providers? This is the syntax in my sip.conf:
; Asterisk can register as a SIP user agent to a SIP proxy (provider)
; Format for the register statement is:
; register => [peer?][transport://]user[@domain][:secret[:authuser]]@
host[:port][/extension][~expiry]
And these:
;registertimeout=20 ; retry registration calls every 20 seconds (default)
;registerattempts=10 ; Number of registration attempts b
