VoIP TechTalk

Wow ... now has arrived SkypeIn Germany. I think that we were the last country for this :) The German regulation ist not so easy for the ITSP.

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.

Tom Keating has made an exciting review of the new Linksys CIT200 Skype Phone. What I think about this is - what are the next steps for it? Is this the forcast of the scanario -"Turn of your PC - anyway, skype what you can" - the skype client is sitting in the Linksys Access Router (IAD?). And after that, the business customer have the next skype client in the Cisco Access Equipment? Very interesting thinking ...

After 3 weeks in a hospital and disconnected from any internet access I´m back at home. It is impossible to comment everything what is happend the last weeks. Some highlights from my view:
1. VON Boston (commented on Jeffs Blog)
2. eBay aquires skype (unbelievable price for free phone calling)
3. some new Drafts out (I will comment some later)

So I will write about the things they will come. Hopefully in a shorter update time :)

The NetworkingPipeline reports, that Enterprises with VoIP installation are now focussing on the security issues. "The firm reports that more than three-quarters of organizations that have deployed VoIP solutions intend to upgrade their replace their current security appliances within the next twelve months." But the problems with VoIP Security not yet solved. "Security product vendors are adding functions that address voice applications in their products, but, as history has shown, security typically lags behind advances in technology."
The full report is available on the In-Stat Website.

Ok - not so new, but available :)
A solution for the HERFP caused by forked SIP INVITE requests
Publisher: Jeroen van Bemmel
This document describes a solution to the Heterogeneous Error Response Forking Problem (HERFP), a situation in which a UAC remains unaware of elements that are responding to its INVITE with a 'repairable' error response, because a forking proxy in the signalling path only forwards what it considers the 'best' final response. This issue may cause communication establishment to be delayed or even fail. To address this issue this document proposes a new method [preliminarily called 'FIX'] to be used by a forking proxy that detects a HERFP to notify the UAC of a repairable error.

J.van Bemmel worked for a research project "4G+" with very interesting conclusions and a Demonstrator:
"The result is an integrated demonstrator including all the components we have developed and tested during the project. We have validated that seamless roaming requires that users have access to networks with authentication under the hood (no user interaction required). We have built enhanced components to support detection of networks and interfaces, the decision process on the best possible network to use and selection of network and interface. We have tested mobility with Mobile IP, SIP and proprietary application layer protocol to support session mobility. While individual mobility protocols solve many but not all problems, combining Mobile IP and SIP creates a new range of issues that need further research. We created a solution to supply the mobility manager on the mobile terminal with knowledge of the network (in a secure fashion): authentication method, network cost, network characteristics, value added services etc."

Read and learn ...

Today pulver.com announce the Top 100 in the worldwide communications sector. The list is on the website available. Jon Arnold made an interesting statistc about it. What I have to say about it - perhaps this sounds a little bit provocative - there is no big player from the service provider or telco. They are provding and developing the innovations in infrastructure (xDSL, xDSL+ or IMS). Without this, there is no services like VoIP etc. possible. Have they no room in this list? What do you think?
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Today I receive an email from Jon:
"The Pulver 100 is just for private companies, so you wouldn't see any big telcos there. I'm sure you picked that there are smaller operators in the mix, like M5 Networks, and of course, Vonage and even Skype.

That said, the Pulver 100 will likely evolve soon to include public companies - probably as a separate listing -and that's where you'd find the big vendors and carriers."

OK - then we are waiting :)

Hello everyone,

today I will start my own Blog to contribute my impressions and knowledge around the communication technology. Sometimes in German and (perhaps) mostly in English. Hope you enjoy this and give me feedback so you will.

I´m working for a systemintegrator and being technical involved in IP Communication projects. So I have to do with the standards and WG around SIP, NGN and IMS.