Infos on IMS oriented, SIP-based VoIP-Solutions
All basics of SIP-based VoIP are defined in the RFCs from ietf.
Some important rfcs are
See the ietf-RFCs for information on SIP-headers, messages and behaviour at
For information on the IMS architecture, see at the creators of this,
3GPP.
The Specs of the 3GPP - called TS and TR - can be obtained from
The specs from 3GPP.
One of the members of 3GPP is the European Telecommunications Standards Institute
ETSI.
Specs for a NGN IMS can be downloaded from
ETSI NGN
If an IMS should merge IP-based VoIP (a NGN IMS) with cellulars, have a look at
oma (Open Mobile Alliance).
oma specifications related to an IMS can be obtained from
oma ims specs.
See, where it works:
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