Useful Links

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H.323 & SIP is a site dedicated to making H.323 a free and open standard for internet use.
The SIP Center is a useful central resource for the Session Initiation Protocol.

PDS Supplier Sites
Argus hand held ISDN and xDSL test telephones.
LanTraffic V2, IP Test & Measure and NetDisturb.

Standards Organisations
The European Telecommunications Standards Institute.
The International Telecommunications Union.
American National Standards Institute.

Useful xDSL Sites
The DSL forum.