On Tue, Jun 23, 2015 at 9:37 AM, Rafael Possamai <rafael@gav.ufsc.br> wrote:
Reading about SIP made it seem like latency alone is not an issue, aside from delays which impact verbal communication as previously mentioned. What is going to be much worse is jitter and packet loss. You can eventually get used to a significant delay, but dropped calls and chopped sound renders the service useless.
With modern software implementing a responsive jitter buffer, jitter shouldn't be much of a problem. Practical effect would be a longer delay as the receiver buffers enough packets to deal with the measured variance in receipt times. Perhaps a few chops early in the conversation as the software grows the buffer. Not all SIP implementations are equal. Try yours in a high-jitter environment and see what happens. High packet loss is deadly. That'll depend on the satellite vendor's network implementation, the weather, etc. But then high packet loss is deadly to essentially all IP networking activity. In situations where a high bit error rate (BER) is endemic, the layer-2 vendor is expected to redress that with forward error correction (FEC) and retransmission that trades jitter for loss. I have no idea which satellite vendors are better or worse about this. Regards, Bill Herrin -- William Herrin ................ herrin@dirtside.com bill@herrin.us Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>