[Asterisk-Users] conference problem without zapata interface

[Andrzej Radke]

Hello !

In file app_meetme.c we can read
A ZAPTEL INTERFACE MUST BE\n"
"INSTALLED FOR CONFERENCING FUNCTIONALITY.\n"

I receive message, when I try conference
WARNING[28686]: File app_meetme.c, Line 151 (build_conf): Unable to open 
pseudo channel
    -- Playing 'conf-invalid'


Does it means that I cannot establish conference without
any hardware zaptel interface ???

What can I do if I want make conference only between my sip phones 
using asterisk ??  Buy it ???

Greeting 
Andrzej Radke