From the monthly archives: May 2005

Playing with audio files

By On May 22, 2005 · Leave a Comment

Found a really cool website…. http://elvis.naturalvoices.com/demos/index.html
AT&T Text-to-speech engine with natural voices in US English, UK English, Spanish, German and French. Unfortunately its only good for 30 words so I needed a way to concatenate .wav files and then resample them at lower rates.

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**Concatenate wav files**

Copy and paste this [...]

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Recording incoming & outgoing calls with Asterisk

By On May 22, 2005 · Leave a Comment

Recording incoming & outgoing calls with Asterisk

This was very tricky to set-up, but also full of satisfaction. These adds and changed will record .wav files of all calls incoming and outgoing and concatenate the streams, placing them in the /var/spool/asterisk/monitor directory with a filename detarmined by the date, time and caller/number called from what [...]

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What is the problem with SIP & NAT

By On May 18, 2005 · Leave a Comment

Getting SIP to work across a NAT or several of them from point to point can be very painful…. a sniffer and logs will help you greatly, if you can understand what is going on……

A SIP call involves both SIP signaling and RTP audio streams with the RTCP control streams as a hang-around.

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VoIP Terminology

By On May 16, 2005 · Leave a Comment

* VOIP = Voice Over IP (telephony over the internet/intranet)
* POTS aka PSTN = Plain Old Telephone System (the phone system everyone is familiar with)
* PSTN aka POTS = Public Switched Telephone Network (the phone system everyone is familiar with)
* FXS = Foreign eXchange Service (the interface that connects [...]

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