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Mastering FreeSWITCH
book

Mastering FreeSWITCH

by Anthony Minessale II, Giovanni Maruzzelli
July 2016
Intermediate to advanced
300 pages
6h 49m
English
Packt Publishing
Content preview from Mastering FreeSWITCH

Various important features

Fax transmission has been designed and optimized to fully exploit the physical characteristics of traditional PSTN analogical copper lines, and has been the bête noire of VoIP for a long time. Even the best, uncompressed codecs (G711) are not able to guarantee a high success rate of T30 (for example, fax) transmissions. That's because of the hyperstrict timing requirements that were guaranteed by a real-time analogical transmission, but are practically impossible for an asynchronous digital transmission. We'll see this in a later section of this book, but the SIP solution to this problem is a protocol enhancement called T38. T38 works around the timing problems, but its implementation must be compatible end to end, and ...

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Publisher Resources

ISBN: 9781784398880