The following people have contributed code or other elements to SIPp:

Richard Gayraud
Marc Lamberton
Olivier Jacques
Herve Pellan
David Mansutti
Francois-Xavier Kowalski
Gerard Lyonnaz
Francois Draperi
F. Tarek Rogers
Peter Higginson
Vincent Luba
Shriram Natarajan
Guillaume Teissier
Clement Chen
Wolfgang Beck
Charles P Wright
Martin Van Leeuwen
Andy Aicken
Michael Hirschbichler
Rob Day
Dmitry Semyonov
Jordan Walbesser
Ken Crowell
Peter Lemenkov
Menyus Hegedűs
Mitko Mitev
Matt Williams
Richard Brady
Natanael Copa

SIPp also uses code originally by Aaron Turner (send_packets.c) and L Peter Deutsch (md5.c).

The following people have contributed to SIPp in other useful ways (bug reports, testing, etc.):
Paul Belanger
Jan Stanek
Enrico Hartung
Daniel Swärd
Paul D Smith
Ferenc Wágner
Walter Doekes
Carlo R. Carrano
Kayode Olajide
Daniel Goepp
Vijay Goje