APIs for SIP applications

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There are three types of SIP APIs: (1) source code API such as ones defined by JAIN SIP , libsip++ and pjsip , (2) high-level API to contr...
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Why Open Source?

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In this article I present my view on Open Source Software. There are a number of articles elsewhere that talk about advantages of Open Sourc...

Documenting RFC implementations

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Just wanted to document how I am using the existing documentation such as IETF RFCs and Internet-Drafts in my 39 Peers project. You can loo...

Problems due to NATs and firewalls

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Network Address Translators (NAT) and firewalls create problems for end-to-end connectivity on the Internet. This not only affects P2P-SIP b...

RTMFP vs SIP

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Adobe's RTMFP is not P2P-VoIP as exemplified by Skype. On the other hand, RTMFP is closer to client-server SIP or H.323 where signaling...
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Why does client-server video conference fail?

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I analyze some problems in client-server communication for multi-party video conferencing. Audio communication differs from video in two imp...

Asynchronous Internet Programming

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Programming an Internet application requires several asynchronous events such as network events, file I/O, timers and user interactions. In ...

Programming languages for implementing SIP

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The programming language used for the implementation can affect the software architecture. For example, Flash ActionScript is a pure event-b...
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P2P API

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In this article I describe several sets of APIs for P2P. For a software engineer, designing a good API is very important. A good abstraction...

Welcome to 39 peers!

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I have launched an open-source project named " 39 peers ". From the web site: "The 39 Peers project aims at implementing an ...

memcached

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Recently I got a chance to look at memcached a distributed in-memory cache. There are two ways of scaling databases: (1) replicating with m...

Business out of P2P-SIP

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Here are some of my thoughts on how to make (or save) money with P2P-SIP. There are two points to note: (1) an end-user doesn't know (or...

Data format and interface for external P2P mode

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Last month, Henning and I submitted an internet-draft on "Data format and interface to an external peer-to-peer network for SIP locatio...

Structured vs unstructured P2P or Why we chose DHT for P2P-SIP?

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One of the questions that people ask me is 'whether structured or unstructured P2P works better for SIP-based Internet telephony?'. ...

New internet-drafts

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Last week, there were some new I-Ds on p2p-sip. draft-matthews-p2psip-nats-and-overlays-00.txt The draft analyzes various issues with NAT in...