IV transmission from Transmitter to Receiver side in CTR mode for every call
If you encrypted your data as $c = \mathrm{CTR}_{IV}(m)$ you can send the value $IV || c$ (where $||$ is concatenation) to the decryption side. That side then parses the value it received into $IV$ and $c$ and computes $m = \mathrm{CTR}_{IV}(c)$. No need to keep the $IV$ secret.