Patent ID: 8014324

Claim:
An apparatus, comprising: a first communication interface; a second communication interface; tone control logic coupled to the first interface and the second interface; wherein the tone control logic receives a single data packet with data representative of a guard tone on the first interface, the data representative of a guard tone comprises a frequency for the guard tone; wherein the tone control logic transmits, uninterrupted, the guard tone on the second communication interface at the frequency for the guard tone responsive to receiving single data packet on the first communication interface; wherein the tone control logic receives data packets on the first interface that comprises audio tone data; wherein the tone control logic converts audio tone data in the data packets into audio tones to be transmitted via the second interface; and wherein the tone control logic transmits the guard tone before sending audio tones, uninterruptedly, as long as audio tone data is being received via the first interface within a guard time.