On September 6, 2015 10:55:06 AM PDT, James Knott <james.knott@rogers.com> wrote:
On 09/06/2015 11:28 AM, James Knott wrote:
There is normally only one flow control on a TCP connection, as it works end to end. With a TCP tunnel or VPN you add a 2nd. UDP has the same characteristics as Ethernet, that is best effort, no guarantees.
One other thing, UDP protocols such as SIP can really get messed up by passing through a TCP tunnel. The TCP flow control interferes with the timing necessary for voice calls. There is normally an adaptive buffer that handles the jitter in a series of UDP packets. With TCP flow control and guaranteed delivery, you can easily exceed that buffer. Then the buffer time will increase, causing excessive delay etc.
Not sure I believe that. Most sip clients and servers off tcp support these days, an in my experience the connection is clearly superior. Voice is not that demanding. Buffering issue haven't been an issue between my UK customers and our offices. -- Sent from my Android phone with K-9 Mail. Please excuse my brevity. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org