Jitter buffer size management is performed by receiving, by a network device, a stream of media content packets. Each packet characterized by a timestamp applied at a source. The device determines, for each of at least one consecutive timestamped packet pair of the stream, a difference between the timestamps of packets in the pair. The device estimates a packetization time (ptime) of the stream as a function of each determined difference. The device adjusts size of the jitter buffer as a function of the estimated ptime.