[bug] The SIPP does not release the TCP connection

[QuincyGao]

version: ./sipp -v

SIPp v3.7.3-24-g03d7c04-PCAP.

As a UAC, SIPP uses TCP to connect to OpenSIPS, maintains the connection for 2 minutes, and the number of concurrent connections is 10, a total of 100. However, with each round of concurrency, TCP connections are not released, and the number of TCP Established keeps increasing. My understanding is that if the number of concurrent is 10, then established tcp num is 10.

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./sipp -r 1 -rp 1s -i 172.20.231.3 -t tn -p 5666 -sf proxy.xml -inf $csvfile 172.20.231.4:5262 -l 10 -m 100 -aa -trace_err -error_file ./proxy_error.log

netstat -antp|grep sipp |wc -l 21