A method for concealing packet loss in a received audio stream, the method comprising: receiving, by an audio communication system comprising one or more servers, a sequence of packets of an audio stream in a non-lapped transform domain format, the packets having a sequential order, wherein at least one packet is missing in the sequence, each packet of the audio stream having a received window size; decoding, by the audio communication system, the sequence of packets of the received audio stream from the non-lapped transform domain format to a sequence of packets of a raw audio signal; replacing, by the audio communication system, each packet of the raw audio signal missing in the sequence of packets of the raw audio signal with a reduced-energy signal block, whereby the sequence of packets of the raw audio signal comprises at least one reduced-energy signal block, wherein the at least one reduced-energy signal block has a lower energy in comparison to every other packets of the raw audio signal, such that the reduced-energy signal block is distinguishable from every other packets of the raw audio signal; modifying, by the audio communication system, each reduced-energy signal block of the raw audio signal at one of a beginning boundary and an ending boundary of the reduced-energy signal block; shifting, by the audio communication system, the raw audio signal by a predetermined delay such that the beginning boundary and the ending boundary of each reduced energy signal block of the raw audio signal does not coincide with a peak of a transform window of a lapped transform domain format; encoding, by a server of the one or more servers, the shifted raw audio signal into an encoded audio signal having transform windows in the lapped transform domain format, wherein packet loss-concealment is performed for each transform window of the encoded audio signal that includes a modified reduced-energy signal block; and, after packet loss-concealment has been performed, transmitting, by the audio communication system, the encoded audio signal to an endpoint. receiving, by an audio communication system comprising one or more servers, a sequence of packets of an audio stream in a non-lapped transform domain format, the packets having a sequential order, wherein at least one packet is missing in the sequence, each packet of the audio stream having a received window size; decoding, by the audio communication system, the sequence of packets of the received audio stream from the non-lapped transform domain format to a sequence of packets of a raw audio signal; replacing, by the audio communication system, each packet of the raw audio signal missing in the sequence of packets of the raw audio signal with a reduced-energy signal block, whereby the sequence of packets of the raw audio signal comprises at least one reduced-energy signal block, wherein the at least one reduced-energy signal block has a lower energy in comparison to every other packets of the raw audio signal, such that the reduced-energy signal block is distinguishable from every other packets of the raw audio signal; modifying, by the audio communication system, each reduced-energy signal block of the raw audio signal at one of a beginning boundary and an ending boundary of the reduced-energy signal block; shifting, by the audio communication system, the raw audio signal by a predetermined delay such that the beginning boundary and the ending boundary of each reduced energy signal block of the raw audio signal does not coincide with a peak of a transform window of a lapped transform domain format; encoding, by a server of the one or more servers, the shifted raw audio signal into an encoded audio signal having transform windows in the lapped transform domain format, wherein packet loss-concealment is performed for each transform window of the encoded audio signal that includes a modified reduced-energy signal block; and, after packet loss-concealment has been performed, transmitting, by the audio communication system, the encoded audio signal to an endpoint.