Changes in 3.6.0

Removed unused RTPStream code concerning video streams. Also consolidated the rtpstream audio port usage to reuse the global [media_port] instead of the [rtpstream_audio_port]. Also the -min_rtp_port and -max_rtp_port options have been removed. Advantages: cleaner code, fewer scenario variables. Drawbacks: possible ICMP port unreachable messages for RCTP and video. Also, no easy way to discern different streams if you want to bombard a single UAS with multiple RTP streams. (Issue #192, reported by @atsakiridis.)

Features added in 3.6.0

Added play_dtmf code originally from https://sourceforge.net/p/sipp/patches/50/ (Dmitry Kunilov), then pull #82 (@horacimacias) and then #141 (@vodik). Compile with pcap-play support, and use it by adding <exec play_dtmf="1234*#"/> similar to how you use play_pcap_audio.
- Add RTP payload 96 in your SDP: m=audio [media_port] RTP/AVP 0 96 97 a=rtpmap:0 PCMU/8000 a=rtpmap:96 telephone-event/8000 a=fmtp:96 0-15 a=rtpmap:97 no-op/8000
- Exec syntax is <exec play_dtmf="digits[,length]"/> where digits can be one or more of "0123456789#*ABCD" and length defaults to 200 and must be between 50 and 2000.
- Instead of digits a [field...] keyword is also accepted.
- Make sure you add enough <pause/> after play_dtmf.
Added rtp_echo action (pull #259 by Snom Technology). Compile with --with-rtpstream and use it by adding <rtp_echo value="0"> to stop the RTP echo enabled via -rtp_echo. RTP echo can be restarted via <rtp_echo value="1"> action. Usage example in regress/github-#0259/uas.xml

Recompile entire source after a reconfigure.
Compile with -lncurses if -lcurses does not exist. (Issue #205, reported by Paul Malpass.)
Handle Contact header with extra angle brackets ('<...>') outside of the uri-parameters (in the contact-params). The contact params should not be used in the next_url. (Issue #234, reported by Justin Zimmer.)
Fix TLS issues for during high load. (Issue #241, #243, reported by @sgel83.)
Fix compile issues on old CentOS and Solaris. (Issue #211, #245.)

Fix qop-value in authorization Digest. It can only hold a single value (auth, auth-int, ...) and does not take double quotes, in contrast to the challenge. Some servers returned a 400 upon receiving this. (Issue #191, reported by @artlov.)
Fix compile error on Cygwin. (Issue #193, reported by @Gankarloo.)

Clean up source code, fix typo's, alter warning and error messages, fix pedantic coding style. Add gtest framework and tests. Add regression tests. Fix and improve build scripts (see also: build.sh).
Use better timing with clock_gettime (or clock_get_time on OSX).
Don't complain about the dummy variable _ being used only once.
Ignore 4x NUL keepalive (next to ignoring the CRLF CRLF keepalive).
Add [date] keyword.
Add -trace_screen option to log screen output in a file.
Add -rate_increase option to increase load periodically.
Add -callid_slash_ign to disable the magic triple slash behaviour.a
Alter -aa to also reply to OPTIONS.
Allow replaying pcaps with LINUX_SLL, EN10MB and 802.11 (and ratiotap) link layer types. Handle 802.1Q tagged frames.
Allow starting SIPp without a TERM setting (a "working" terminal).
Allow m=image in SDP to pcapplay faxes/images.
<exec play_pcap_audio="..."/> and friends:
- If the argument is not an absolute path, the pcap is searched next to the scenario, before falling back to checking the current working directory.
- The argument may be enclosed in brackets, in which case it is interpreted as a keyword value; set through the -key command line option. Example: <exec play_pcap_audio="[file1]"/> with option -key file1 /path/to/pcap.