Meetme conference : Timer source

Asterisk Asterisk General
1

Hi all,

         I am in the middle of an argument regarding how meetme works. In our setup here, we do have Digium cards and asterisk 1.6 with DAHDI drivers fully loaded. The argument is simple. If there is a conference of 2 types of callers say in meetme room no's 1000(SIP only) and 1001(DAHDI only, calling from T1)

           1. What is the timing source for room no 1000?[b](Heavily depends on pseudo for mixing)[/b]
           2. What is the timing source for room no 1001?[b](Does not need psedo at all for mixing)[/b]

Am I right in my assumptions, boldened in brackets?

Thank you