[Asterisk-Users] threewaycalling ? (Bridge 2 SIP calls?)

[SamW]

Let me ask a simple question for some to answer. I need asterisk to
perform three-party-conference between SIP phones. Is there any setting
required on sip.conf ? I see Zapata.conf has threewaycalling=yes
parameter. Is there anything similar required in sip.conf or elsewhere.
I do not use any hardware. I use * with Cisco ATA 186 adapters. Thank
you in advance. 

- SamW