Abstract: An intercommunication system with Adaptive Transmit Delay patches audio sources to a radio system (e.g., a trunked-radio system) such that outgoing audio is sent to the radio system as soon as a channel has been acquired, without further transmit delay. The intercommunication system generates a pattern representative of the radio's Talk Permit Tone. The intercommunication system then buffers outgoing audio while analyzing incoming audio from the radio and comparing the incoming audio to the generated pattern to determine when a Talk Permit Tone has been received. When the Talk Permit Tone is received, the intercommunication system releases buffered outgoing audio for transmission.