3. ITU-T recommendations: H.323
Recommendation H.323, originally defined by ITU-T Study Group 16
The adoption and promotion of H.323 as the standard for Internet and intranet voice/video products by Microsoft and Intel, with dozens of smaller publishers following in their wake, has propelled this standard into the limelight of Internet telephony (see Box 2).
The standard now applies to all packet networks (including, of course, the Internet), not just local networks.
H.323 is based on previous ITU-T work on ISDN videotelephony (H.320), incorporating the problems associated with IP networks (including the "best effort" routing policy, with no guarantee of routing...
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ITU-T recommendations: H.323
IETF standards: SIP
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