Hello, I am an an end-user of pjsip via CsipSimple v.0.03-01 r1108 on an Android smartphone, and I'm encountering unexpected pjsip behaviour. Specifically, when the UA is further than 500ms RTT from the server, the initial REGISTER handshake succeds, but subsequent re-REGISTERs fail due to what appears to be a race condition between the UA's retransmision timer and the server's nonce freshness (ie, the nonce stays fresh for less than the RTT due to the retransmit timer being shorter than RTT). Looking at the pjsip's test suite, it seems that network latencies of 200ms and 300ms are tested, but not higher. Should pjsip be able to register on networks with higher latency than 500ms? If yes, what can I do to help this scenario being tested? I've tested this problem by introducing a delay on the linux router with the command "tc qdisc add dev venet0 root netem delay 2000ms". Delays < 475ms cause no registration problems, while >500ms causes consistent registration drops. Thank you, Radu.
