Can the end users regist our VoIP system by receiving one short message(SMS)? And could they also rechage the account by sms,too?

If a voip server change the access number, is their any solution to solve the problem that mass works to update or inform end users? 

The answer is SMS Control!

With our SMS control SIM dialer,the above problems would be solved simply by a short message.

Send a SMS to the IP users,the data of SIM dialer would be revise to your wishes.And if you change your access number,you could keep your customers updated simply via SMS. 

 

Sounds great isn't it? Kindly contact us for more details on IP CALL SMS control.