[Asterisk-Users] Conferancing with different interface

[Ugur GUNCER]

Hi All

How can i made conference first person coming from PRI and second person
dialed from asterisk with SIP.
How will be my extension conf 

I wrote extension for first person 
exten => _5463XXXXXX,1,Answer
exten => _5463XXXXXX,2,MeetMe(1234|a);
exten => _5463XXXXXX,3,Hangup


But i dont know how can call the second person for invite  to conferance
with 
Can some body give me a example