Packetizer
H.323 vs SIP

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
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