Theoretically, infinite. 


We are a cloud provider and so, we tend to have a lot of spare capacity to handle spikes, But please intimate us if you will receive more than 20 concurrent phone calls. We would then just double-check that we have enough spare capacity available to take these calls. 


As a general principle, please intimate support before you undertake an advertisement on Radio, TV or Newspaper.


Support contact details: 

hello@exotel.in

08088-919-888