Hi Vicky,
1. For Multi-seat call Center It will work?
Yes
2. I have to make Multi SIP account For Each user(agent)?
Yes, you will to use "SIP Phone Control" for each agent.
3. can they Use X-Lite as pre-dialler
X-Lite works with RingRoost, but RingRoost does not itself have any auto/pre-dialing functionality.
4. For SIP softphone What Is charge RATE?
You will be looking at the "Standard Rates" found here : https://www.ringroost.com/pricing.php
5. How Manny SIP Account I can Make In PBX?
Unlimited
Thanks,
RingRoost Support Team