When a person dials your virtual number, they are charged normal call rates for calling unless you have a toll-free number.
Once the call goes through your AT stash(AT api account balance) is also charged 1/- per minute. Essentially, for inbound calls, both the caller and the callee(you) are charged.
When you are dialing a client's number. They are not charged. The only billing done is to your AT stash.
SIP calls are 1/- per minute for SIP to SIP, i.e firstname.lastname@example.org calling email@example.com. Calls to regular numbers and virtual numbers are still charged 5/- per minute.
Side note: if your XML includes a <Dial/> action the number being dialed is not charged. However, you are charged 1/- for calls to a SIP number and 5/- for calls to regular numbers , which brings it to a total of 6/-.
Our Pricing across different countries can be found here:
For any more clarifications send an email to firstname.lastname@example.org or email@example.com