Comparisons between H.323 and SIP

This is a collection of H.323/SIP comparisons, listed in roughly chronological order, that range from accurate and up-to-date to egregious and obsolete. Responses that were originally sent as private email have been edited slightly.

Title	Date	Response
Service Architectures in H.323 and SIP: A Comparison	4th Quarter 2003	NA
SIP Vs. H.323 - A Comparison	2003	NA
At-a-glance comparison of H.323, SIP, and H.248(Megaco)/MGCP	2002	NA
Two VoIP protocols compared	December 24, 2001	Our response
SIP and H.323	2001	Our response
H.323 vs. SIP Telephony	2001	Our response
SIP and H.323 For Voice/Video Over IP -- Complement, Don't Compete	August 2001	Our response
Service Architectures in H.323 and SIP--A Comparison	July 2001	No response
Voice Over Internet Protocol (VoIP) - current technology and comparison of H.323 with SIP -	May 2001	Our response
SIP Rules!	May 1, 2000	Our response
Predicting Internet Telephony Call Setup Delay	April 2000	SIP also now recommends use of TCP
A Comparison of H.323v4 and SIP	January 5, 2000	This inaccurate document is why 3GPP adopted SIP
Comparison of H.323 and SIP for IP Telephony Signaling	September 1999	No response
A Comparison of SIP and H.323 for Internet Telephony	July 1998	So old, not worth responding to
Comparison of H.323 and SIP	1998?	So old, not worth responding to