Short answer: depending on what role you are acting during the communication.
In the case when calls and meetings naturally belong to receiving your tasks, reporting your results (including weekly/monthly meetings), or resolving technical issues, I would say that the rate should be the same.
However, if you help others getting their tasks, balance these tasks among several people, this can be considered Manager's role and may be billed at another rate.
(Update) There could be other roles, like Solution Architect or Business Analyst, you name it depending on your company's and projects' staffing schemes. They are hard to separate in case of single-person projects, but when your project team grows, and you are doing these tasks, you will have some opportunity to charge different rates.
A side note, make sure that time spent for Communication and Team Collaboration purposes should be a special article in project timeline. This would prevent people thinking that communication is for free.