# IV transmission from Transmitter to Receiver side in CTR mode for every call

I am using block cipher mode (CTR Mode) for the transmission of voice data. Need to know, how can I transfer the same IV at the decryption side (for every call) as the IV for the same packets on encryption and decryption sides must be the same.

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.