> Does anyone have any familiarity with "decode latency," specifically > with Sipura devices? Why would it take 200+ms to decode a 20ms RTP > packet? G.711u has existed for over 30 years, how hard could it be?
Although I have never seem the decode latency to go above 30 ms on a LAN, it does go up to 80 ms if the Sipura device (phone or ATA) is connected via an Internet link which has jitter. So I don't know for sure, but my understanding is that it's the delay from the arrival of the packet until it's played; this is not due to the actual decoding but probably mostly due to the jitter buffer in the device, which is adjusted dynamically depending on the traffic conditions. More jitter = larger buffer to try to compensate for late packets rather than considering them lost. Anyone correct me if I'm wrong here. Having said that, I don't notice the delay or distorted voice even if the decode latency is as high as 80 ms. Not sure about 200+ ms, but it seems rather high and would imply to me that you have a connectivity issue somewhere on your LAN. --Luki _______________________________________________ --Bandwidth and Colocation sponsored by Easynews.com -- Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
