tcp sends send-q blocking, preventing data from being sent.
Video conference product, run H323 protocol stack to make a call, the first call is normal, after hanging up, when making the second call, tcp data can not appear
send, so that the call cannot be established. After a problem occurs, you must wait about 10 seconds before you can return to normal.
use ss-tei to view the socket status as follows:
1. Normal call with status of keepalive
2persist
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