VoIP TechTalk

Hello,
and again a lot of to read:
Best Current Practices for NAT Traversal for SIP
Traversal of the Session Initiation Protocol (SIP) and the sessions it establishes through Network Address Translators (NAT) is a complex problem. Currently there are many deployment scenarios and traversal mechanisms for media traffic. This document aims to provide concrete recommendations and a unified method for NAT traversal as well as documenting corresponding call flows.

Requirements for SIP-based Peer-to-Peer Internet Telephony
This document defines requirements for designing peer-to-peer voice, text, and real-time multimedia communication system protocols.

Rejecting Anonymous Requests in the Session Initiation Protocol (SIP)
The Session Initiation Protocol (SIP) allows for users to make anonymous calls. However, users receiving such calls have the right to reject them because they are anonymous. SIP has no way to indicate to the caller that the reason for call rejection was that the call was anonymous. Such an indication is useful to allow the call to be retried without anonymity. This specification defines a new SIP response code for this purpose.