Panoramisk / The VoIP druid 

One of the main issue with SIP is that NAT traversal is a nightmare. When you connect to your corporate network using a VPN, it is not easy to use a sip hard phone. Using a softphone is, in general, the simplest way.

However a small tool really useful can help you: Siproxd
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When we left traditional telephony for a VOIP solution, we have, more than before, the way to connect PBX to all other existing systems. Controlling a phone using his desktop computer is really useful.
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You are now an IP telephony user and have installed an Asterisk. You are using an IP Centrex link to a SIP or IAX operator. Go to the next level with peer-to-peer telephony with ENUM.
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The Canadian manufacturer Aastra will soon officially announce the venue of a new Wi-Fi SIP phone, called 312, even if the net is already buzzing this info. There are already SIP DECT phone at Aastra but since some customers would like to leverage their Wi-Fi infrastructure in order to carry voice, this new product arrive at a good time.
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When working in the IP telephony world it is crucial to know how to use a network analyzer, in order to understand how the traffic is circulating over the network. This article presents some interesting Wireshark features related to voice over IP protocols.
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